Bump proc-macro2 from 1.0.82 to 1.0.86 (#5638)

Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.82
to 1.0.86.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/dtolnay/proc-macro2/releases">proc-macro2's
releases</a>.</em></p>
<blockquote>
<h2>1.0.86</h2>
<ul>
<li>Documentation improvements</li>
</ul>
<h2>1.0.85</h2>
<ul>
<li>Mark some tests as only for 64-bit targets (<a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/463">#463</a>)</li>
</ul>
<h2>1.0.84</h2>
<ul>
<li>Documentation improvements (<a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/455">#455</a>,
thanks <a
href="https://github.com/CensoredUsername"><code>@​CensoredUsername</code></a>)</li>
</ul>
<h2>1.0.83</h2>
<ul>
<li>Optimize the representation of <code>Ident</code> (<a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/462">#462</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/aa9476b27932ae1b1b50bbfe0530b3b261fc1b72"><code>aa9476b</code></a>
Release 1.0.86</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/19613587b70633e8bd383dd2fc29856d2d080f45"><code>1961358</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/466">#466</a>
from dtolnay/buildrs</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/e1bd2cc29da09be421555bb0e1156c5e2b87df5d"><code>e1bd2cc</code></a>
Bring build script comments up to date</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/5b271279521e11ac6eada5435e5a8d87f46d3619"><code>5b27127</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/465">#465</a>
from dtolnay/ignorereason</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/0da4629757024ac6dac1680ba3be44bac24af809"><code>0da4629</code></a>
Fill in ignore reasons in all #[ignore] attributes</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/5ee1cabadb40abe12abe27e3b34de8fc6f60bc0a"><code>5ee1cab</code></a>
Release 1.0.85</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/aa64c2007390a33d4edbc07aa3e576848ae3d653"><code>aa64c20</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/proc-macro2/issues/464">#464</a>
from dtolnay/testsize</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/bc9f4d938058be43d38f921f34f48b94a25278b7"><code>bc9f4d9</code></a>
Ignore size tests on non-64bit target</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/1160ec3c7d723e115c5acf2b4e9f00c2c049e84a"><code>1160ec3</code></a>
Make size tests #[ignore] in cfg(randomize_layout)</li>
<li><a
href="https://github.com/dtolnay/proc-macro2/commit/33c95785826bbd1fa353c48989dfc5a7ca62f54c"><code>33c9578</code></a>
Release 1.0.84</li>
<li>Additional commits viewable in <a
href="https://github.com/dtolnay/proc-macro2/compare/1.0.82...1.0.86">compare
view</a></li>
</ul>
</details>
<br />


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