Bump multidict from 6.6.2 to 6.6.3 (#11253)

Bumps [multidict](https://github.com/aio-libs/multidict) from 6.6.2 to
6.6.3.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/aio-libs/multidict/releases">multidict's
releases</a>.</em></p>
<blockquote>
<h2>6.6.3</h2>
<h2>Bug fixes</h2>
<ul>
<li>
<p>Fixed inconsistencies generated by the C implementation of
<code>_md_shrink()</code> which might later lead to assertion failures
and crash -- by :user:<code>Romain-Geissler-1A</code>.</p>
<p><em>Related issues and pull requests on GitHub:</em>
<a
href="https://redirect.github.com/aio-libs/multidict/issues/1229">#1229</a>.</p>
</li>
</ul>
<hr />
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/aio-libs/multidict/blob/master/CHANGES.rst">multidict's
changelog</a>.</em></p>
<blockquote>
<h1>6.6.3</h1>
<p><em>(2025-06-30)</em></p>
<h2>Bug fixes</h2>
<ul>
<li>
<p>Fixed inconsistencies generated by the C implementation of
<code>_md_shrink()</code> which might later lead to assertion failures
and crash -- by :user:<code>Romain-Geissler-1A</code>.</p>
<p><em>Related issues and pull requests on GitHub:</em>
:issue:<code>1229</code>.</p>
</li>
</ul>
<hr />
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/aio-libs/multidict/commit/dbd686f37c1bc14355dce9c16dbbfae82f11dc00"><code>dbd686f</code></a>
Bump to 6.6.3 (<a
href="https://redirect.github.com/aio-libs/multidict/issues/1230">#1230</a>)</li>
<li><a
href="https://github.com/aio-libs/multidict/commit/ac621054343a7deffa429f3dfd3267a2f8b91e10"><code>ac62105</code></a>
Fixed inconsistencies generated by _md_shrink. (<a
href="https://redirect.github.com/aio-libs/multidict/issues/1229">#1229</a>)</li>
<li>See full diff in <a
href="https://github.com/aio-libs/multidict/compare/v6.6.2...v6.6.3">compare
view</a></li>
</ul>
</details>
<br />


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requirements/base.txt

@@ -24,7 +24,7 @@ gunicorn==23.0.0
     # via -r requirements/base.in
 idna==3.6
     # via yarl
-multidict==6.6.2
+multidict==6.6.3
     # via
     #   -r requirements/runtime-deps.in
     #   yarl

requirements/constraints.txt

@@ -113,7 +113,7 @@ markupsafe==3.0.2
     # via jinja2
 mdurl==0.1.2
     # via markdown-it-py
-multidict==6.6.2
+multidict==6.6.3
     # via
     #   -r requirements/multidict.in
     #   -r requirements/runtime-deps.in

requirements/cython.txt

@@ -6,7 +6,7 @@
 #
 cython==3.1.2
     # via -r requirements/cython.in
-multidict==6.6.2
+multidict==6.6.3
     # via -r requirements/multidict.in
 typing-extensions==4.14.0
     # via multidict

requirements/dev.txt

@@ -111,7 +111,7 @@ markupsafe==3.0.2
     # via jinja2
 mdurl==0.1.2
     # via markdown-it-py
-multidict==6.6.2
+multidict==6.6.3
     # via
     #   -r requirements/runtime-deps.in
     #   yarl

requirements/multidict.txt

@@ -4,7 +4,7 @@
 #
 #    pip-compile --allow-unsafe --output-file=requirements/multidict.txt --resolver=backtracking --strip-extras requirements/multidict.in
 #
-multidict==6.6.2
+multidict==6.6.3
     # via -r requirements/multidict.in
 typing-extensions==4.14.0
     # via multidict

requirements/runtime-deps.txt

@@ -22,7 +22,7 @@ frozenlist==1.7.0
     #   aiosignal
 idna==3.6
     # via yarl
-multidict==6.6.2
+multidict==6.6.3
     # via
     #   -r requirements/runtime-deps.in
     #   yarl

requirements/test.txt

@@ -57,7 +57,7 @@ markdown-it-py==3.0.0
     # via rich
 mdurl==0.1.2
     # via markdown-it-py
-multidict==6.6.2
+multidict==6.6.3
     # via
     #   -r requirements/runtime-deps.in
     #   yarl