Bump rand from 0.7.3 to 0.8.5 (#2645)

Bumps [rand](https://github.com/rust-random/rand) from 0.7.3 to 0.8.5.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/rust-random/rand/blob/master/CHANGELOG.md">rand's
changelog</a>.</em></p>
<blockquote>
<h2>[0.8.5] - 2021-08-20</h2>
<h3>Fixes</h3>
<ul>
<li>Fix build on non-32/64-bit architectures (<a
href="https://redirect.github.com/rust-random/rand/issues/1144">#1144</a>)</li>
<li>Fix &quot;min_const_gen&quot; feature for <code>no_std</code> (<a
href="https://redirect.github.com/rust-random/rand/issues/1173">#1173</a>)</li>
<li>Check <code>libc::pthread_atfork</code> return value with panic on
error (<a
href="https://redirect.github.com/rust-random/rand/issues/1178">#1178</a>)</li>
<li>More robust reseeding in case <code>ReseedingRng</code> is used from
a fork handler (<a
href="https://redirect.github.com/rust-random/rand/issues/1178">#1178</a>)</li>
<li>Fix nightly: remove unused <code>slice_partition_at_index</code>
feature (<a
href="https://redirect.github.com/rust-random/rand/issues/1215">#1215</a>)</li>
<li>Fix nightly + <code>simd_support</code>: update
<code>packed_simd</code> (<a
href="https://redirect.github.com/rust-random/rand/issues/1216">#1216</a>)</li>
</ul>
<h3>Rngs</h3>
<ul>
<li><code>StdRng</code>: Switch from HC128 to ChaCha12 on emscripten (<a
href="https://redirect.github.com/rust-random/rand/issues/1142">#1142</a>).
We now use ChaCha12 on all platforms.</li>
</ul>
<h3>Documentation</h3>
<ul>
<li>Added docs about rand's use of const generics (<a
href="https://redirect.github.com/rust-random/rand/issues/1150">#1150</a>)</li>
<li>Better random chars example (<a
href="https://redirect.github.com/rust-random/rand/issues/1157">#1157</a>)</li>
</ul>
<h2>[0.8.4] - 2021-06-15</h2>
<h3>Additions</h3>
<ul>
<li>Use const-generics to support arrays of all sizes (<a
href="https://redirect.github.com/rust-random/rand/issues/1104">#1104</a>)</li>
<li>Implement <code>Clone</code> and <code>Copy</code> for
<code>Alphanumeric</code> (<a
href="https://redirect.github.com/rust-random/rand/issues/1126">#1126</a>)</li>
<li>Add <code>Distribution::map</code> to derive a distribution using a
closure (<a
href="https://redirect.github.com/rust-random/rand/issues/1129">#1129</a>)</li>
<li>Add <code>Slice</code> distribution (<a
href="https://redirect.github.com/rust-random/rand/issues/1107">#1107</a>)</li>
<li>Add <code>DistString</code> trait with impls for
<code>Standard</code> and <code>Alphanumeric</code> (<a
href="https://redirect.github.com/rust-random/rand/issues/1133">#1133</a>)</li>
</ul>
<h3>Other</h3>
<ul>
<li>Reorder asserts in <code>Uniform</code> float distributions for
easier debugging of non-finite arguments
(<a
href="https://redirect.github.com/rust-random/rand/issues/1094">#1094</a>,
<a
href="https://redirect.github.com/rust-random/rand/issues/1108">#1108</a>)</li>
<li>Add range overflow check in <code>Uniform</code> float distributions
(<a
href="https://redirect.github.com/rust-random/rand/issues/1108">#1108</a>)</li>
<li>Deprecate <code>rngs::adapter::ReadRng</code> (<a
href="https://redirect.github.com/rust-random/rand/issues/1130">#1130</a>)</li>
</ul>
<h2>[0.8.3] - 2021-01-25</h2>
<h3>Fixes</h3>
<ul>
<li>Fix <code>no-std</code> + <code>alloc</code> build by gating
<code>choose_multiple_weighted</code> on <code>std</code> (<a
href="https://redirect.github.com/rust-random/rand/issues/1088">#1088</a>)</li>
</ul>
<h2>[0.8.2] - 2021-01-12</h2>
<h3>Fixes</h3>
<ul>
<li>Fix panic in <code>UniformInt::sample_single_inclusive</code> and
<code>Rng::gen_range</code> when
providing a full integer range (eg <code>0..=MAX</code>) (<a
href="https://redirect.github.com/rust-random/rand/issues/1087">#1087</a>)</li>
</ul>
<h2>[0.8.1] - 2020-12-31</h2>
<h3>Other</h3>
<ul>
<li>Enable all stable features in the playground (<a
href="https://redirect.github.com/rust-random/rand/issues/1081">#1081</a>)</li>
</ul>
<h2>[0.8.0] - 2020-12-18</h2>
<h3>Platform support</h3>
<ul>
<li>The minimum supported Rust version is now 1.36 (<a
href="https://redirect.github.com/rust-random/rand/issues/1011">#1011</a>)</li>
<li><code>getrandom</code> updated to v0.2 (<a
href="https://redirect.github.com/rust-random/rand/issues/1041">#1041</a>)</li>
<li>Remove <code>wasm-bindgen</code> and <code>stdweb</code> feature
flags. For details of WASM support,</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/rust-random/rand/commit/937320cbfeebd4352a23086d9c6e68f067f74644"><code>937320c</code></a>
Update CHANGELOG for 0.8.5 (<a
href="https://redirect.github.com/rust-random/rand/issues/1221">#1221</a>)</li>
<li><a
href="https://github.com/rust-random/rand/commit/2924af688d352b889322870d017356f12651866b"><code>2924af6</code></a>
Merge pull request <a
href="https://redirect.github.com/rust-random/rand/issues/1183">#1183</a>
from vks/fill-float-doc</li>
<li><a
href="https://github.com/rust-random/rand/commit/dbbc1bf3176138c867f3d84c0c4d288119a5a84e"><code>dbbc1bf</code></a>
Merge pull request <a
href="https://redirect.github.com/rust-random/rand/issues/1218">#1218</a>
from Will-Low/master</li>
<li><a
href="https://github.com/rust-random/rand/commit/9f20df04d88698c38515833d6db62d7eb50d8b80"><code>9f20df0</code></a>
Making distributions comparable by deriving PartialEq. Tests
included</li>
<li><a
href="https://github.com/rust-random/rand/commit/a407bdfa4563d0cfbf744049242926c8de079d3f"><code>a407bdf</code></a>
Merge pull request <a
href="https://redirect.github.com/rust-random/rand/issues/1216">#1216</a>
from rust-random/work5</li>
<li><a
href="https://github.com/rust-random/rand/commit/d3ca11b0bcc1f42fe34ba4f90f99509b7eb4ff18"><code>d3ca11b</code></a>
Update to packed_simd_2 0.3.7</li>
<li><a
href="https://github.com/rust-random/rand/commit/fa04c15d0bb5842fdbdbb73d7a53ead36f3fcf52"><code>fa04c15</code></a>
Merge pull request <a
href="https://redirect.github.com/rust-random/rand/issues/1215">#1215</a>
from Lantern-chat/master</li>
<li><a
href="https://github.com/rust-random/rand/commit/73f8ffd16379390e624ac53cd6882dd679dd9a6f"><code>73f8ffd</code></a>
Remove unused <code>slice_partition_at_index</code> feature</li>
<li><a
href="https://github.com/rust-random/rand/commit/8f372500f05dfadcff6c35e773e81029ab7debad"><code>8f37250</code></a>
Merge pull request <a
href="https://redirect.github.com/rust-random/rand/issues/1208">#1208</a>
from newpavlov/rand_distr/fix_no_std</li>
<li><a
href="https://github.com/rust-random/rand/commit/9ef737ba5b814f6ab36cebafb59ad29885d68a05"><code>9ef737b</code></a>
update changelog</li>
<li>Additional commits viewable in <a
href="https://github.com/rust-random/rand/compare/0.7.3...0.8.5">compare
view</a></li>
</ul>
</details>
<br />


[![Dependabot compatibility
score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=rand&package-manager=cargo&previous-version=0.7.3&new-version=0.8.5)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores

)

Dependabot will resolve any conflicts with this PR as long as you don't
alter it yourself. You can also trigger a rebase manually by commenting
`@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits
that have been made to it
- `@dependabot merge` will merge this PR after your CI passes on it
- `@dependabot squash and merge` will squash and merge this PR after
your CI passes on it
- `@dependabot cancel merge` will cancel a previously requested merge
and block automerging
- `@dependabot reopen` will reopen this PR if it is closed
- `@dependabot close` will close this PR and stop Dependabot recreating
it. You can achieve the same result by closing it manually
- `@dependabot show <dependency name> ignore conditions` will show all
of the ignore conditions of the specified dependency
- `@dependabot ignore <dependency name> major version` will close this
group update PR and stop Dependabot creating any more for the specific
dependency's major version (unless you unignore this specific
dependency's major version or upgrade to it yourself)
- `@dependabot ignore <dependency name> minor version` will close this
group update PR and stop Dependabot creating any more for the specific
dependency's minor version (unless you unignore this specific
dependency's minor version or upgrade to it yourself)
- `@dependabot ignore <dependency name>` will close this group update PR
and stop Dependabot creating any more for the specific dependency
(unless you unignore this specific dependency or upgrade to it yourself)
- `@dependabot unignore <dependency name>` will remove all of the ignore
conditions of the specified dependency
- `@dependabot unignore <dependency name> <ignore condition>` will
remove the ignore condition of the specified dependency and ignore
conditions


</details>

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>