chore(cargo deps): Bump serde from 1.0.216 to 1.0.217 (#63)

Bumps [serde](https://github.com/serde-rs/serde) from 1.0.216 to
1.0.217.
<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>v1.0.217</h2>
<ul>
<li>Support serializing externally tagged unit variant inside flattened
field (<a
href="https://redirect.github.com/serde-rs/serde/issues/2786">#2786</a>,
thanks <a
href="https://github.com/Mingun"><code>@​Mingun</code></a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/serde-rs/serde/commit/930401b0dd58a809fce34da091b8aa3d6083cb33"><code>930401b</code></a>
Release 1.0.217</li>
<li><a
href="https://github.com/serde-rs/serde/commit/cb6eaea151b831db36457fff17f16a195702dad4"><code>cb6eaea</code></a>
Fix roundtrip inconsistency:</li>
<li><a
href="https://github.com/serde-rs/serde/commit/b6f339ca3676584e1c26028b4040c337b0105e34"><code>b6f339c</code></a>
Resolve repr_packed_without_abi clippy lint in tests</li>
<li><a
href="https://github.com/serde-rs/serde/commit/2a5caea1a8abc9b6077d8eb43bd6109124db2a5f"><code>2a5caea</code></a>
Merge pull request <a
href="https://redirect.github.com/serde-rs/serde/issues/2872">#2872</a>
from dtolnay/ehpersonality</li>
<li><a
href="https://github.com/serde-rs/serde/commit/b9f93f99aaa90760d421b60b8de6273999ca8980"><code>b9f93f9</code></a>
Add no-std CI on stable compiler</li>
<li><a
href="https://github.com/serde-rs/serde/commit/eb5cd476ba7e71e22b0a856c1e78a3af1b7bbe0a"><code>eb5cd47</code></a>
Drop #[lang = &quot;eh_personality&quot;] from no-std test</li>
<li><a
href="https://github.com/serde-rs/serde/commit/8478a3b7dd847753440bdaf65b828a4a535e6cef"><code>8478a3b</code></a>
Merge pull request <a
href="https://redirect.github.com/serde-rs/serde/issues/2871">#2871</a>
from dtolnay/nostdstart</li>
<li><a
href="https://github.com/serde-rs/serde/commit/dbb909136e610b9753dcd9ffcfb8f6a3f6510060"><code>dbb9091</code></a>
Replace #[start] with extern fn main</li>
<li>See full diff in <a
href="https://github.com/serde-rs/serde/compare/v1.0.216...v1.0.217">compare
view</a></li>
</ul>
</details>
<br />


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