Bump unsafe-libyaml from 0.2.9 to 0.2.10 (#2776)

Bumps [unsafe-libyaml](https://github.com/dtolnay/unsafe-libyaml) from
0.2.9 to 0.2.10.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/dtolnay/unsafe-libyaml/releases">unsafe-libyaml's
releases</a>.</em></p>
<blockquote>
<h2>0.2.10</h2>
<ul>
<li>Fix write to improperly aligned pointer in 32-bit targets (<a
href="https://redirect.github.com/dtolnay/unsafe-libyaml/issues/21">#21</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/unsafe-libyaml/commit/61f3ab82b271ac90d6a04f65520614ca08c58abe"><code>61f3ab8</code></a>
Release 0.2.10</li>
<li><a
href="https://github.com/dtolnay/unsafe-libyaml/commit/d90d7abc4e31d590881a055c6ade175e40cd498f"><code>d90d7ab</code></a>
Clean up some redundant casts</li>
<li><a
href="https://github.com/dtolnay/unsafe-libyaml/commit/7755559145c9cf5573639bfecc557893d4a46b0d"><code>7755559</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/unsafe-libyaml/issues/24">#24</a>
from dtolnay/mallocalign</li>
<li><a
href="https://github.com/dtolnay/unsafe-libyaml/commit/b8a0863c1bb2a0e1b3d226679e4a7bd31d14c2b4"><code>b8a0863</code></a>
Fix insufficient alignment of malloc's return value on 32-bit</li>
<li><a
href="https://github.com/dtolnay/unsafe-libyaml/commit/389373f0d99dd8726eb52199e622056aa1d4ac8f"><code>389373f</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/unsafe-libyaml/issues/23">#23</a>
from dtolnay/malloc</li>
<li><a
href="https://github.com/dtolnay/unsafe-libyaml/commit/fd41ef659dcd9eaa973771985edce227cdcfe084"><code>fd41ef6</code></a>
Check arithmetic in malloc computations</li>
<li><a
href="https://github.com/dtolnay/unsafe-libyaml/commit/9e054fbfee5523f904bd70091170ad7a0e5402a2"><code>9e054fb</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/unsafe-libyaml/issues/22">#22</a>
from dtolnay/force</li>
<li><a
href="https://github.com/dtolnay/unsafe-libyaml/commit/5b40a9e0edc5c5e87585d49f9fd34603c2c4742b"><code>5b40a9e</code></a>
Check more arithmetic operations</li>
<li><a
href="https://github.com/dtolnay/unsafe-libyaml/commit/97a4332d8d5a47478e659cb9b872ed6613eee8a9"><code>97a4332</code></a>
Delete cast to long followed by size_t</li>
<li><a
href="https://github.com/dtolnay/unsafe-libyaml/commit/e5f4bbd0f0ff8c48c8df8e88f810e5d0c4143159"><code>e5f4bbd</code></a>
Clean up duplicated casting to size_t</li>
<li>Additional commits viewable in <a
href="https://github.com/dtolnay/unsafe-libyaml/compare/0.2.9...0.2.10">compare
view</a></li>
</ul>
</details>
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