[chore(cargo)](deps): Bump serde from 1.0.167 to 1.0.168 (#186)

Bumps [serde](https://github.com/serde-rs/serde) from 1.0.167 to
1.0.168.
<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>v1.0.168</h2>
<ul>
<li>Allow <code>serde::de::IgnoredAny</code> to be the type for a
<code>serde(flatten)</code> field (<a
href="https://redirect.github.com/serde-rs/serde/issues/2436">#2436</a>,
thanks <a
href="https://github.com/Mingun"><code>@​Mingun</code></a>)</li>
<li>Allow larger preallocated capacity for smaller elements (<a
href="https://redirect.github.com/serde-rs/serde/issues/2494">#2494</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/serde-rs/serde/commit/09b78b24e94933b94a6db997ce5934db98a39bcc"><code>09b78b2</code></a>
Release 1.0.168</li>
<li><a
href="https://github.com/serde-rs/serde/commit/a622b8a74afe1ef1d799cef50cf0947925ca0810"><code>a622b8a</code></a>
Merge pull request <a
href="https://redirect.github.com/serde-rs/serde/issues/2495">#2495</a>
from dtolnay/cautious</li>
<li><a
href="https://github.com/serde-rs/serde/commit/399ef081ecc36d2f165ff1f6debdcbf6a1dc7efb"><code>399ef08</code></a>
Allow larger preallocated capacity for smaller elements</li>
<li><a
href="https://github.com/serde-rs/serde/commit/3686277e1485161ff46587a49e60abb148d00128"><code>3686277</code></a>
Merge pull request <a
href="https://redirect.github.com/serde-rs/serde/issues/2436">#2436</a>
from Mingun/flatten-ignored-any</li>
<li>See full diff in <a
href="https://github.com/serde-rs/serde/compare/v1.0.167...v1.0.168">compare
view</a></li>
</ul>
</details>
<br />


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