chore(deps-rs): bump serde from 1.0.202 to 1.0.203 (#365)

Bumps [serde](https://github.com/serde-rs/serde) from 1.0.202 to
1.0.203.
<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>v1.0.203</h2>
<ul>
<li>Documentation improvements (<a
href="https://redirect.github.com/serde-rs/serde/issues/2747">#2747</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/serde-rs/serde/commit/d5bc546ca53be0b31984a06a8ad587cbea4ca5ce"><code>d5bc546</code></a>
Release 1.0.203</li>
<li><a
href="https://github.com/serde-rs/serde/commit/45ae217728e9163103c47f9bd04502368caaf446"><code>45ae217</code></a>
Merge pull request <a
href="https://redirect.github.com/serde-rs/serde/issues/2747">#2747</a>
from dtolnay/variadic</li>
<li><a
href="https://github.com/serde-rs/serde/commit/b7b97dda7333baf6474517e3646754be54e3796b"><code>b7b97dd</code></a>
Unindent implementation inside tuple_impl_body macro</li>
<li><a
href="https://github.com/serde-rs/serde/commit/5d3c563d469ef36ce5a01f1612f53883fee20db5"><code>5d3c563</code></a>
Document tuple impls as fake variadic</li>
<li><a
href="https://github.com/serde-rs/serde/commit/376185458b48aeb2774ecc26422cc9499e564117"><code>3761854</code></a>
Merge pull request <a
href="https://redirect.github.com/serde-rs/serde/issues/2745">#2745</a>
from dtolnay/docsrs</li>
<li><a
href="https://github.com/serde-rs/serde/commit/a8f14840ab3ff58f533cd27d0f91955d57f12a65"><code>a8f1484</code></a>
Rely on docs.rs to define --cfg=docsrs by default</li>
<li>See full diff in <a
href="https://github.com/serde-rs/serde/compare/v1.0.202...v1.0.203">compare
view</a></li>
</ul>
</details>
<br />


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