Bumps [secp256k1](https://github.com/rust-bitcoin/rust-secp256k1) from
0.24.3 to 0.28.0.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/rust-bitcoin/rust-secp256k1/blob/master/CHANGELOG.md">secp256k1's
changelog</a>.</em></p>
<blockquote>
<h1>0.28.0 - 2023-10-23</h1>
<ul>
<li>Add bindings to the ElligatorSwift implementation <a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/pull/627">#627</a></li>
<li>Depend on recent release of <code>bitcoin_hashes</code> v0.13.0 <a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/pull/621">#621</a></li>
<li>Add a verify function to <code>PublicKey</code> <a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/pull/618">#618</a></li>
<li>Add serialize function for schnorr::Signature <a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/pull/607">#607</a></li>
<li>Bump MSRV to 1.48 <a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/pull/595">#595</a></li>
<li>Remove implementations of <code>PartialEq</code>, <code>Eq</code>,
<code>PartialOrd</code>, <code>Ord</code>, and <code>Hash</code> from
the
<code>impl_array_newtype</code> macro. Users will now need to derive
these traits if they are wanted.</li>
</ul>
<h1>0.27.0 - 2023-03-15</h1>
<ul>
<li><a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/pull/588">Depend
on newly release <code>bitcoin_hashes</code> v0.12</a>.</li>
<li><a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/pull/578">Implement
<code>Debug</code> trait for <code>Scalar</code> type</a>.</li>
<li><a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/pull/582">Implement
<code>insecure-erase</code></a>.</li>
</ul>
<h1>0.26.0 - 2202-12-19</h1>
<ul>
<li>Update libsecp25k1 to v0.2.0</li>
</ul>
<h1>0.25.0 - 2022-12-07</h1>
<ul>
<li><a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/pull/548">Fix
soundness issue with <code>preallocated_gen_new</code></a></li>
<li>Update to <code>secp256k1-sys</code> <a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/pull/549">v0.7.0</a></li>
<li>Use type system to <a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/pull/483">improve
safety</a>.</li>
<li><a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/pull/490">Change
secp256k1-sys symbol names to 0_6_1</a>.</li>
<li><a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/pull/499">Introduce
<code>rustfmt</code></a> to the codebase.</li>
<li><a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/pull/507">Make
all raw pointer methods go through the CPtr trait</a>.</li>
<li><a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/pull/518">Make
comparison functions stable</a>.</li>
<li><a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/pull/512">Remove</a>
public constant <code>ONE_KEY</code> (consider using
<code>FromStr</code> as a replacement).</li>
</ul>
<h1>0.24.1 - 2022-10-25</h1>
<ul>
<li><a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/issues/491">Fix
broken deserialization logic of <code>KeyPair</code></a> that previously
always panicked. After the patch deserialization only panics if neither
the <code>global-context</code> nor the <code>alloc</code> (default)
feature is active.</li>
</ul>
<h1>0.24.0 - 2022-07-20</h1>
<ul>
<li>Upgrade to new release of <a
href="https://github.com/rust-bitcoin/bitcoin_hashes/releases/tag/0.11.0">bitcoin_hashes</a>.</li>
</ul>
<h1>0.23.4 - 2022-07-14</h1>
<ul>
<li><a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/pull/474">Disable
automatic rerandomization of contexts under WASM</a></li>
</ul>
<h1>0.23.3 - 2022-06-29</h1>
<ul>
<li><a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/pull/465">Add
must_use for mut self key manipulation methods</a></li>
<li><a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/pull/466">Fix
fuzzing feature guard</a></li>
</ul>
<h1>0.23.2 - 2022-06-27</h1>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/rust-bitcoin/rust-secp256k1/commit/7de09c8050da12a13ef9ee3850597f69c887952d"><code>7de09c8</code></a>
Merge <a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/issues/256">rust-bitcoin/rust-secp256k1256</a>:
Tracking PR for release: `secp256k1 v0...</li>
<li><a
href="https://github.com/rust-bitcoin/rust-secp256k1/commit/3dc5b165401f249c01a88cec54061301cffd97a0"><code>3dc5b16</code></a>
Bump version to v0.28.0</li>
<li><a
href="https://github.com/rust-bitcoin/rust-secp256k1/commit/3aada83180beec2b9f5ab8e7b9280a5517d3bcde"><code>3aada83</code></a>
Merge <a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/issues/256">rust-bitcoin/rust-secp256k1256</a>:
Add bindings to the ElligatorSwift imp...</li>
<li><a
href="https://github.com/rust-bitcoin/rust-secp256k1/commit/39febcb866ce285d53052a3636602f04483aa710"><code>39febcb</code></a>
Create rust-bidings</li>
<li><a
href="https://github.com/rust-bitcoin/rust-secp256k1/commit/da4f67b274c3061717723a568cfb182e4e2e7cce"><code>da4f67b</code></a>
Merge <a
href="https://redirect.github.com/rust-bitcoin/rust-secp256k1/issues/256">rust-bitcoin/rust-secp256k1256</a>:
Update vendored lib secp256k1 to v0.4.0</li>
<li><a
href="https://github.com/rust-bitcoin/rust-secp256k1/commit/80b2a8d4aa6ffa72041d569eab2278cd8c1ace2a"><code>80b2a8d</code></a>
Update vendored libsecp to v0.4.0</li>
<li><a
href="https://github.com/rust-bitcoin/rust-secp256k1/commit/d2285c929a086276ce6d1670d795c49191e30c65"><code>d2285c9</code></a>
ci: Remove MIPS* from CI</li>
<li><a
href="https://github.com/rust-bitcoin/rust-secp256k1/commit/0d58f50d523b40a78de0b87146208e3ad338c8ba"><code>0d58f50</code></a>
ci: generalize grp in &quot;illegal callback&quot; test</li>
<li><a
href="https://github.com/rust-bitcoin/rust-secp256k1/commit/acf9ac13e9f8df84dd52d2f012cda7211a6af10c"><code>acf9ac1</code></a>
delete <code>test_manual_create_destroy</code> test</li>
<li><a
href="https://github.com/rust-bitcoin/rust-secp256k1/commit/04ce50891bb0d49be5355f5c0d82db70d7dda65a"><code>04ce508</code></a>
lib: fix bad unit test</li>
<li>Additional commits viewable in <a
href="https://github.com/rust-bitcoin/rust-secp256k1/compare/secp256k1-0.24.3...secp256k1-0.28.0">compare
view</a></li>
</ul>
</details>
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