Build: Bump cython from 3.1.2 to 3.1.3 (#2351)

Bumps [cython](https://github.com/cython/cython) from 3.1.2 to 3.1.3.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/cython/cython/blob/master/CHANGES.rst">cython's
changelog</a>.</em></p>
<blockquote>
<h1>3.1.3 (2025-??-??)</h1>
<h2>Bugs fixed</h2>
<ul>
<li>
<p>Some method calls with 0 or 1 argument failed to use
<code>PyObject_VectorCallMethod()</code>.</p>
</li>
<li>
<p><code>cython.pythread_type_lock</code> (also used as fallback for
<code>cython.pymutex</code>)
could stall on heavily contended locks.
(Github issue :issue:<code>6999</code>)</p>
</li>
<li>
<p>C string arrays (not pointers) always coerced to the Python default
string type,
even on explicit casts to other string types.
(Github issue :issue:<code>7020</code>)</p>
</li>
<li>
<p>An internal C function was not marked as <code>static</code> and
leaked a linker symbol.
(Github issue :issue:<code>6957</code>)</p>
</li>
<li>
<p>Compatibility with PyPy3.8 was lost by accident.</p>
</li>
<li>
<p>The Linux binary wheels of 3.1.2 used SSSE3 CPU instructions which
are not available on some CPUs.
(Github issue :issue:<code>7038</code>)</p>
</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/cython/cython/commit/8a1b3c10260fa9f9a91475819d737bce59b1a3d0"><code>8a1b3c1</code></a>
Build: Explicitly exclude GraalPython and Freethreaded Python wheels
because ...</li>
<li><a
href="https://github.com/cython/cython/commit/c1a622f927b57eb35284e12319e73df008b855c5"><code>c1a622f</code></a>
Update changelog.</li>
<li><a
href="https://github.com/cython/cython/commit/68ff5dc8c621552b06b5a5a280ad695f72d988c8"><code>68ff5dc</code></a>
Fix code-generation with walrus+literals (<a
href="https://redirect.github.com/cython/cython/issues/6989">GH-6989</a>)</li>
<li><a
href="https://github.com/cython/cython/commit/85aeae1246962e6b13db40a9357804bf9dd81fd8"><code>85aeae1</code></a>
Fix bug with tokenizing apparent named character literals in raw string
(<a
href="https://redirect.github.com/cython/cython/issues/7057">#7057</a>)</li>
<li><a
href="https://github.com/cython/cython/commit/308c3f92a8cdb8fccbbf0df309c7fdf6c3925199"><code>308c3f9</code></a>
Build: Exclude freethreading Python wheels in 3.1.x because we currently
use ...</li>
<li><a
href="https://github.com/cython/cython/commit/0edc6736ce262be242448f86ae27c861a8803e0a"><code>0edc673</code></a>
Build: Fix matrix generation.</li>
<li><a
href="https://github.com/cython/cython/commit/f95a8ba8b863e6745d34ee145b4d40e12103f5fa"><code>f95a8ba</code></a>
Build: Use latest cibuildwheel to include Py3.14.</li>
<li><a
href="https://github.com/cython/cython/commit/968aecf17d8ddf931c5df824427589d92b8122dc"><code>968aecf</code></a>
Prepare release of 3.1.3.</li>
<li><a
href="https://github.com/cython/cython/commit/9cee731d5f341723fa2e43693b35c510c855cbb0"><code>9cee731</code></a>
Update changelog.</li>
<li><a
href="https://github.com/cython/cython/commit/d4cb2fda6ee90d7204cefe83d225771ac11900f7"><code>d4cb2fd</code></a>
Build: Do not require wheel for building (<a
href="https://redirect.github.com/cython/cython/issues/7084">GH-7084</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/cython/cython/compare/3.1.2...3.1.3">compare
view</a></li>
</ul>
</details>
<br />


[![Dependabot compatibility
score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=cython&package-manager=pip&previous-version=3.1.2&new-version=3.1.3)](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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]