Merge #566

566: Bump once_cell from 1.15.0 to 1.16.0 r=mkroening a=dependabot[bot]

Bumps [once_cell](https://github.com/matklad/once_cell) from 1.15.0 to 1.16.0.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/matklad/once_cell/blob/master/CHANGELOG.md">once_cell's changelog</a>.</em></p>
<blockquote>
<h2>1.16.0</h2>
<ul>
<li>Add <code>no_std</code> implementation based on <code>critical-section</code>,
<a href="https://github-redirect.dependabot.com/matklad/once_cell/pull/195">#195</a>.</li>
<li>Deprecate <code>atomic-polyfill</code> feature (use the new <code>critical-section</code> instead)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/matklad/once_cell/commit/18e47d73088c0d60ec4a7da50b4ef50417bbc5df"><code>18e47d7</code></a> Merge <a href="https://github-redirect.dependabot.com/matklad/once_cell/issues/206">#206</a></li>
<li><a href="https://github.com/matklad/once_cell/commit/06ff1bd31fe480b27497b89472fd0d4d33f281c4"><code>06ff1bd</code></a> publish 1.16.0</li>
<li><a href="https://github.com/matklad/once_cell/commit/04e1d59ce7d0d8f2d73c12e84919b927c37bc9e7"><code>04e1d59</code></a> Merge <a href="https://github-redirect.dependabot.com/matklad/once_cell/issues/204">#204</a></li>
<li><a href="https://github.com/matklad/once_cell/commit/32ba3f8aa8b88ea36dff2ae4767cd3b22f2d1634"><code>32ba3f8</code></a> clarify MSRV</li>
<li><a href="https://github.com/matklad/once_cell/commit/0ebafa5d2f74e35f56f7b7300037b7c26da24bb8"><code>0ebafa5</code></a> Merge <a href="https://github-redirect.dependabot.com/matklad/once_cell/issues/203">#203</a></li>
<li><a href="https://github.com/matklad/once_cell/commit/cb85e6b8b8231e2f7bf21e96825113ddcb7244a8"><code>cb85e6b</code></a> publish 1.16.0-pre.1</li>
<li><a href="https://github.com/matklad/once_cell/commit/b56e329d70dcc0f2f223d738fe3520b1f842e435"><code>b56e329</code></a> Merge <a href="https://github-redirect.dependabot.com/matklad/once_cell/issues/195">#195</a></li>
<li><a href="https://github.com/matklad/once_cell/commit/7d9afdb9d794b549b87a6d7c6611e3a28ec1588a"><code>7d9afdb</code></a> Add comment explaining <code>Mutex\&lt;unsync::OnceCell&gt;</code>.</li>
<li><a href="https://github.com/matklad/once_cell/commit/32dada4dbe48ea45c63749b45a476a1d46af75a2"><code>32dada4</code></a> Fix features.</li>
<li><a href="https://github.com/matklad/once_cell/commit/23d129038fddb4ec2336ec5879f6482cafe4bd5c"><code>23d1290</code></a> Decrease <code>critical-section</code> version.</li>
<li>Additional commits viewable in <a href="https://github.com/matklad/once_cell/compare/v1.15.0...v1.16.0">compare view</a></li>
</ul>
</details>
<br />


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