build(deps): bump rustversion from 1.0.20 to 1.0.21 (#37090)

Bumps [rustversion](https://github.com/dtolnay/rustversion) from 1.0.20
to 1.0.21.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/dtolnay/rustversion/releases">rustversion's
releases</a>.</em></p>
<blockquote>
<h2>1.0.21</h2>
<ul>
<li>Support <code>-Zfmt-debug=none</code> (<a
href="https://redirect.github.com/dtolnay/rustversion/issues/61">#61</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dtolnay/rustversion/commit/1f833903f93e6dbabf9eebb5935fcafd2f6f0ce1"><code>1f83390</code></a>
Release 1.0.21</li>
<li><a
href="https://github.com/dtolnay/rustversion/commit/8be70573321aa3d616fcf46b7df7c98d0d3cdc1a"><code>8be7057</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/rustversion/issues/61">#61</a>
from dtolnay/debugnone</li>
<li><a
href="https://github.com/dtolnay/rustversion/commit/91dd8ef7b1e999d3a733d8136b60d6e9c0290d9d"><code>91dd8ef</code></a>
Ignore elidable_lifetime_names pedantic clippy lint</li>
<li><a
href="https://github.com/dtolnay/rustversion/commit/052138c8c8c6e13ee49dc94cbeb04962f5e54db3"><code>052138c</code></a>
Support -Zfmt-debug=none</li>
<li><a
href="https://github.com/dtolnay/rustversion/commit/17dc0fd54f1591305d55e784745193f5867d34ee"><code>17dc0fd</code></a>
Pin nightly toolchain used for miri job</li>
<li>See full diff in <a
href="https://github.com/dtolnay/rustversion/compare/1.0.20...1.0.21">compare
view</a></li>
</ul>
</details>
<br />


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