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="1f833903f9"><code>1f83390</code></a>
Release 1.0.21</li>
<li><a
href="8be7057332"><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="91dd8ef7b1"><code>91dd8ef</code></a>
Ignore elidable_lifetime_names pedantic clippy lint</li>
<li><a
href="052138c8c8"><code>052138c</code></a>
Support -Zfmt-debug=none</li>
<li><a
href="17dc0fd54f"><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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Cargo.lock

@@ -6235,9 +6235,9 @@ dependencies = [
 
 [[package]]
 name = "rustversion"
-version = "1.0.20"
+version = "1.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eded382c5f5f786b989652c49544c4877d9f015cc22e145a5ea8ea66c2921cd2"
+checksum = "8a0d197bd2c9dc6e53b84da9556a69ba4cdfab8619eb41a8bd1cc2027a0f6b1d"
 
 [[package]]
 name = "ryu"