⬆️ Bump golang.org/x/net from 0.20.0 to 0.21.0 in /utils (#421)

Bumps [golang.org/x/net](https://github.com/golang/net) from 0.20.0 to
0.21.0.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/golang/net/commit/73d21fdbb4d7dc7115b50526b93b6c37a4e3377f"><code>73d21fd</code></a>
go.mod: update golang.org/x dependencies</li>
<li><a
href="https://github.com/golang/net/commit/643fd162e36ae58085b92ff4c0fec0bafe5a46a7"><code>643fd16</code></a>
html: fix SOLIDUS '/' handling in attribute parsing</li>
<li><a
href="https://github.com/golang/net/commit/73e4b50dadcf3bd6015efb8b6e8ddbeb7dfe74c5"><code>73e4b50</code></a>
dns/dnsmessage: allow name compression for SRV resource parsing</li>
<li><a
href="https://github.com/golang/net/commit/b2208d046df5625a4f78624149cba7722c4ccfee"><code>b2208d0</code></a>
internal/quic/qlog: fix typo</li>
<li><a
href="https://github.com/golang/net/commit/0d0b98c1378dba60d10c77c383c40f94c1641cfc"><code>0d0b98c</code></a>
http2: avoid goroutine starvation in
TestServer_Push_RejectAfterGoAway</li>
<li><a
href="https://github.com/golang/net/commit/07e05fd6e95ab445ebe48840c81a027dbace3b8e"><code>07e05fd</code></a>
http2: remove suspicious uint32-&gt;v conversion in frame code</li>
<li><a
href="https://github.com/golang/net/commit/26b646ea024741dd5d8e141fc33d8149c465686a"><code>26b646e</code></a>
quic: avoid deadlock in Endpoint.Close</li>
<li>See full diff in <a
href="https://github.com/golang/net/compare/v0.20.0...v0.21.0">compare
view</a></li>
</ul>
</details>
<br />


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</details>

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Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Monty Bot <[email protected]>
Co-authored-by: Adrien CABARBAYE <[email protected]>

changes/20240208113514.bugfix

@@ -0,0 +1 @@
+Dependency upgrade: net-0.21.0

changes/20240208113516.bugfix

@@ -0,0 +1 @@
+Dependency upgrade: net-0.21.0