build(deps): bump camino from 1.2.0 to 1.2.1 (#39579)

Bumps [camino](https://github.com/camino-rs/camino) from 1.2.0 to 1.2.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/camino-rs/camino/releases">camino's
releases</a>.</em></p>
<blockquote>
<h2>camino 1.2.1</h2>
<h3>Fixed</h3>
<p>Replaced obsolete <code>doc_auto_cfg</code> with
<code>doc_cfg</code>, to fix Rust nightly builds with the
<code>doc_cfg</code> flag enabled.</p>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/camino-rs/camino/blob/main/CHANGELOG.md">camino's
changelog</a>.</em></p>
<blockquote>
<h2>[1.2.1] - 2025-09-29</h2>
<h3>Fixed</h3>
<p>Replaced obsolete <code>doc_auto_cfg</code> with
<code>doc_cfg</code>, to fix Rust nightly builds with the
<code>doc_cfg</code> flag enabled.</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="28e15dbd8a"><code>28e15db</code></a>
[camino] version 1.2.1</li>
<li><a
href="f32d994393"><code>f32d994</code></a>
prepare release</li>
<li><a
href="ea187e4ebb"><code>ea187e4</code></a>
remove doc_auto_cfg (<a
href="https://redirect.github.com/camino-rs/camino/issues/114">#114</a>)</li>
<li><a
href="b0c8086459"><code>b0c8086</code></a>
remove references to dead features from README</li>
<li>See full diff in <a
href="https://github.com/camino-rs/camino/compare/camino-1.2.0...camino-1.2.1">compare
view</a></li>
</ul>
</details>
<br />


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Cargo.lock

@@ -1131,9 +1131,9 @@ dependencies = [
 
 [[package]]
 name = "camino"
-version = "1.2.0"
+version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e1de8bc0aa9e9385ceb3bf0c152e3a9b9544f6c4a912c8ae504e80c1f0368603"
+checksum = "276a59bf2b2c967788139340c9f0c5b12d7fd6630315c15c217e559de85d2609"
 dependencies = [
  "serde_core",
 ]