Bump uvloop from 0.21.0b1 to 0.21.0 (#9491)

Bumps [uvloop](https://github.com/MagicStack/uvloop) from 0.21.0b1 to
0.21.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/MagicStack/uvloop/releases">uvloop's
releases</a>.</em></p>
<blockquote>
<h2>v0.21.0</h2>
<h1>Changes</h1>
<ul>
<li>Add cleanup_socket param on create_unix_server()
(<a
href="https://redirect.github.com/MagicStack/uvloop/issues/623">#623</a>)
(by <a href="https://github.com/fantix"><code>@​fantix</code></a> in
d6114d2)</li>
</ul>
<h1>Fixes</h1>
<ul>
<li>
<p>Use cythonized SO_REUSEPORT rather than the unwrapped native one. (<a
href="https://redirect.github.com/MagicStack/uvloop/issues/609">#609</a>)
(by <a href="https://github.com/ptribble"><code>@​ptribble</code></a> in
4083a94e for <a
href="https://redirect.github.com/MagicStack/uvloop/issues/550">#550</a>)</p>
</li>
<li>
<p>UDP errors should result in protocol.error_received (<a
href="https://redirect.github.com/MagicStack/uvloop/issues/601">#601</a>)
(by <a
href="https://github.com/jensbjorgensen"><code>@​jensbjorgensen</code></a>
in 3c3bbeff)</p>
</li>
<li>
<p>Updates for Cython3 (<a
href="https://redirect.github.com/MagicStack/uvloop/issues/587">#587</a>)
(by <a
href="https://github.com/alan-brooks"><code>@​alan-brooks</code></a> in
3fba9fab for <a
href="https://redirect.github.com/MagicStack/uvloop/issues/587">#587</a>)</p>
</li>
<li>
<p>Test with Python 3.13 (<a
href="https://redirect.github.com/MagicStack/uvloop/issues/610">#610</a>)
(by <a
href="https://github.com/edgarrmondragon"><code>@​edgarrmondragon</code></a>
in fb5a139)</p>
</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/MagicStack/uvloop/commit/2e8feae2a6db57bb611ffa388d28443487f4db94"><code>2e8feae</code></a>
bump cibuildwheel version</li>
<li><a
href="https://github.com/MagicStack/uvloop/commit/40e8a34c8bcee281a115d1ea4149205b849f7724"><code>40e8a34</code></a>
uvloop 0.21.0</li>
<li>See full diff in <a
href="https://github.com/MagicStack/uvloop/compare/v0.21.0beta1...v0.21.0">compare
view</a></li>
</ul>
</details>
<br />


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requirements/base.txt

@@ -40,7 +40,7 @@ pycparser==2.22
     # via cffi
 typing-extensions==4.12.2
     # via multidict
-uvloop==0.21.0b1 ; platform_system != "Windows" and implementation_name == "cpython"
+uvloop==0.21.0 ; platform_system != "Windows" and implementation_name == "cpython"
     # via -r requirements/base.in
 yarl==1.15.2
     # via -r requirements/runtime-deps.in

requirements/constraints.txt

@@ -261,7 +261,7 @@ uritemplate==4.1.1
     # via gidgethub
 urllib3==2.2.3
     # via requests
-uvloop==0.21.0b1 ; platform_system != "Windows"
+uvloop==0.21.0 ; platform_system != "Windows"
     # via
     #   -r requirements/base.in
     #   -r requirements/lint.in

requirements/dev.txt

@@ -253,7 +253,7 @@ uritemplate==4.1.1
     # via gidgethub
 urllib3==2.2.3
     # via requests
-uvloop==0.21.0b1 ; platform_system != "Windows" and implementation_name == "cpython"
+uvloop==0.21.0 ; platform_system != "Windows" and implementation_name == "cpython"
     # via
     #   -r requirements/base.in
     #   -r requirements/lint.in

requirements/lint.txt

@@ -116,7 +116,7 @@ typing-extensions==4.12.2
     #   typer
 urllib3==2.2.3
     # via requests
-uvloop==0.21.0b1 ; platform_system != "Windows"
+uvloop==0.21.0 ; platform_system != "Windows"
     # via -r requirements/lint.in
 valkey==6.0.2
     # via -r requirements/lint.in

requirements/test.txt

@@ -131,7 +131,7 @@ typing-extensions==4.12.2
     #   typer
 urllib3==2.2.3
     # via requests
-uvloop==0.21.0b1 ; platform_system != "Windows" and implementation_name == "cpython"
+uvloop==0.21.0 ; platform_system != "Windows" and implementation_name == "cpython"
     # via -r requirements/base.in
 wait-for-it==2.2.2
     # via -r requirements/test.in