Bump cython from 3.0.7 to 3.0.8 (#8019)

Bumps [cython](https://github.com/cython/cython) from 3.0.7 to 3.0.8.
<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>3.0.8 (2024-01-10)</h1>
<h2>Bugs fixed</h2>
<ul>
<li>
<p>Using <code>const</code> together with defined fused types could fail
to compile.
(Github issue :issue:<code>5230</code>)</p>
</li>
<li>
<p>A &quot;use after free&quot; bug was fixed in parallel sections.
(Github issue :issue:<code>5922</code>)</p>
</li>
<li>
<p>Several types were not available as <code>cython.*</code> types in
pure Python code.</p>
</li>
<li>
<p>The generated code is now correct C89 again, removing some C++ style
<code>//</code> comments
and C99-style declaration-after-code code ordering. This is still
relevant for some
ols C compilers, specifically ones that match old Python 2.7
installations.</p>
</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/cython/cython/commit/a1b79a6bc5326406ad73af73f5b41e3bb5f8da6e"><code>a1b79a6</code></a>
Prepare release of 3.0.8.</li>
<li><a
href="https://github.com/cython/cython/commit/b9bfa7f0492f4f71af1f034822fd90dd4ed3638e"><code>b9bfa7f</code></a>
Fix parsing of ptrdiff_t in PyrexTypes and add another &quot;all types
in Shadow.p...</li>
<li><a
href="https://github.com/cython/cython/commit/f974ec15b643dfb6338c0aef90976424d5a6bd2c"><code>f974ec1</code></a>
Update changelog.</li>
<li><a
href="https://github.com/cython/cython/commit/ffe6fa7fe47e6b5005c0aad7c6ae7144b3402f33"><code>ffe6fa7</code></a>
Avoid C99-isms.</li>
<li><a
href="https://github.com/cython/cython/commit/356495be50773262b09e158115aba0afe167cb97"><code>356495b</code></a>
Avoid C99-ism.</li>
<li><a
href="https://github.com/cython/cython/commit/b85be7e838318d251fc3d3fbfdf1a1ecf5a515fd"><code>b85be7e</code></a>
Avoid C99-ism.</li>
<li><a
href="https://github.com/cython/cython/commit/30a6534a2279eddfd7a8b75de94897357eeaba2b"><code>30a6534</code></a>
Fix some C99-isms in 3.0.x branch.</li>
<li><a
href="https://github.com/cython/cython/commit/9866ce478fa76a07babff8a5d9d53a4030eaf9e7"><code>9866ce4</code></a>
Avoid C99-ism.</li>
<li><a
href="https://github.com/cython/cython/commit/6990d6e24f89949c4cf32d143d8c20e516d93756"><code>6990d6e</code></a>
Use Py3.6 instead of Py3.7/8/9 for the C89 build since CPython switched
to C9...</li>
<li><a
href="https://github.com/cython/cython/commit/d3b92b0a4207ee070405d6f1ab8a75e95b53c56a"><code>d3b92b0</code></a>
Use Py3.7 instead of Py3.9 for the C89 build since CPython switched to
C99 at...</li>
<li>Additional commits viewable in <a
href="https://github.com/cython/cython/compare/3.0.7...3.0.8">compare
view</a></li>
</ul>
</details>
<br />


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requirements/constraints.txt

@@ -56,7 +56,7 @@ cryptography==41.0.3
     # via
     #   pyjwt
     #   trustme
-cython==3.0.7
+cython==3.0.8
     # via -r requirements/cython.in
 distlib==0.3.7
     # via virtualenv

requirements/cython.txt

@@ -4,7 +4,7 @@
 #
 #    pip-compile --allow-unsafe --output-file=requirements/cython.txt --resolver=backtracking --strip-extras requirements/cython.in
 #
-cython==3.0.7
+cython==3.0.8
     # via -r requirements/cython.in
 multidict==6.0.4
     # via -r requirements/multidict.in