Bump multidict from 6.6.2 to 6.6.3 (aio-libs#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 />


[![Dependabot compatibility
score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=multidict&package-manager=pip&previous-version=6.6.2&new-version=6.6.3)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

Dependabot will resolve any conflicts with this PR as long as you don't
alter it yourself. You can also trigger a rebase manually by commenting
`@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits
that have been made to it
- `@dependabot merge` will merge this PR after your CI passes on it
- `@dependabot squash and merge` will squash and merge this PR after
your CI passes on it
- `@dependabot cancel merge` will cancel a previously requested merge
and block automerging
- `@dependabot reopen` will reopen this PR if it is closed
- `@dependabot close` will close this PR and stop Dependabot recreating
it. You can achieve the same result by closing it manually
- `@dependabot show <dependency name> ignore conditions` will show all
of the ignore conditions of the specified dependency
- `@dependabot ignore this major version` will close this PR and stop
Dependabot creating any more for this major version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop
Dependabot creating any more for this minor version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop
Dependabot creating any more for this dependency (unless you reopen the
PR or upgrade to it yourself)


</details>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

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