Bump serde from 1.0.215 to 1.0.216 (#2575)

Bumps [serde](https://github.com/serde-rs/serde) from 1.0.215 to
1.0.216.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/serde-rs/serde/releases">serde's
releases</a>.</em></p>
<blockquote>
<h2>v1.0.216</h2>
<ul>
<li>Mark all generated impls with #[automatically_derived] to exclude
from code coverage (<a
href="https://redirect.github.com/serde-rs/serde/issues/2866">#2866</a>,
<a
href="https://redirect.github.com/serde-rs/serde/issues/2868">#2868</a>,
thanks <a
href="https://github.com/tdittr"><code>@​tdittr</code></a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/serde-rs/serde/commit/ad8dd4148b5fabf0d643d4de604a0616f2796506"><code>ad8dd41</code></a>
Release 1.0.216</li>
<li><a
href="https://github.com/serde-rs/serde/commit/f91d2ed9aef4d7e86171333ff745f40ee6e83692"><code>f91d2ed</code></a>
Merge pull request <a
href="https://redirect.github.com/serde-rs/serde/issues/2868">#2868</a>
from dtolnay/automaticallyderived</li>
<li><a
href="https://github.com/serde-rs/serde/commit/9497463718813e83b69db4343bb6e8db5f28441e"><code>9497463</code></a>
Mark all generated trait impls as #[automatically_derived]</li>
<li><a
href="https://github.com/serde-rs/serde/commit/46e9ecfcdd5216929ebcf29e76adc072412c5380"><code>46e9ecf</code></a>
Merge pull request <a
href="https://redirect.github.com/serde-rs/serde/issues/2866">#2866</a>
from tdittr/mark-visitors-as-generated</li>
<li><a
href="https://github.com/serde-rs/serde/commit/e9c399c822aad494ab1e935a95f1a591a99b44ad"><code>e9c399c</code></a>
Mark generated <code>impl de::Visitor</code> blocks as
<code>#[automatically_derived]</code></li>
<li><a
href="https://github.com/serde-rs/serde/commit/b9dbfcb4ac3b7a663d9efc6eb1387c62302a6fb4"><code>b9dbfcb</code></a>
Switch out fnv in favor of foldhash in test</li>
<li><a
href="https://github.com/serde-rs/serde/commit/c270e27a4d37f008c199523f223843e8659b7fd9"><code>c270e27</code></a>
Use BuildHasher instead of Hasher in collection macros</li>
<li><a
href="https://github.com/serde-rs/serde/commit/0307f604ea5ca91de1f65d1db075d5cc5abb00ad"><code>0307f60</code></a>
Resolve question_mark clippy lint in build script</li>
<li>See full diff in <a
href="https://github.com/serde-rs/serde/compare/v1.0.215...v1.0.216">compare
view</a></li>
</ul>
</details>
<br />


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