Bump setuptools from 70.2.0 to 70.3.0 (#87)

Bumps [setuptools](https://github.com/pypa/setuptools) from 70.2.0 to
70.3.0.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/pypa/setuptools/blob/main/NEWS.rst">setuptools's
changelog</a>.</em></p>
<blockquote>
<h1>v70.3.0</h1>
<h2>Features</h2>
<ul>
<li>Support for loading distutils from the standard library is now
deprecated, including use of SETUPTOOLS_USE_DISTUTILS=stdlib and
importing distutils before importing setuptools. (<a
href="https://github.com/pypa/setuptools/issues/4137">#4137</a>)</li>
</ul>
<h2>Bugfixes</h2>
<ul>
<li><code>pypa/distutils#268</code></li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/pypa/setuptools/commit/356e9a00c4f04c1c6cf76a4a5f97325d0ab4df46"><code>356e9a0</code></a>
Bump version: 70.2.0 → 70.3.0</li>
<li><a
href="https://github.com/pypa/setuptools/commit/822280ba9992bed7ca4bb314d24e6344478be379"><code>822280b</code></a>
Merge pull request <a
href="https://github.com/pypa/setuptools/issues/4463">#4463</a>
from pypa/bugfix/distutils-34f9518ef</li>
<li><a
href="https://github.com/pypa/setuptools/commit/c4e64c194285e73895a858fa226cd5225beebfed"><code>c4e64c1</code></a>
Add news fragment.</li>
<li><a
href="https://github.com/pypa/setuptools/commit/b01183c19952625d7461ab5c8cb0a07c39c98c9e"><code>b01183c</code></a>
Merge <a
href="https://github.com/pypa/distutils">https://github.com/pypa/distutils</a>
into bugfix/distutils-34f9518ef</li>
<li><a
href="https://github.com/pypa/setuptools/commit/e221581f8023b5c7b8d54a78ef80edadcac55d24"><code>e221581</code></a>
Merge pull request <a
href="https://github.com/pypa/distutils/issues/267">pypa/distutils#267</a>
from msys2-contrib/customize_compiler_m...</li>
<li><a
href="https://github.com/pypa/setuptools/commit/34f9518ef5b50d546893fc29386d4d11866dd9db"><code>34f9518</code></a>
Merge pull request <a
href="https://github.com/pypa/setuptools/issues/4410">#4410</a>
from pypa/debt/4137-deprecate-distutils-stdlib</li>
<li><a
href="https://github.com/pypa/setuptools/commit/bacd9c6f92ed1926644f5743d7139d16ee65801b"><code>bacd9c6</code></a>
sysconfig: skip customize_compiler() with MSVC Python again</li>
<li><a
href="https://github.com/pypa/setuptools/commit/4a3406baf94b1ef8122364b417c9564344a52921"><code>4a3406b</code></a>
CI: also set CC/CXX when pip installing with mingw+clang</li>
<li><a
href="https://github.com/pypa/setuptools/commit/e9f0be98ea4faaba4a7b2d07ba994a81fde8f42f"><code>e9f0be9</code></a>
Merge pull request <a
href="https://github.com/pypa/setuptools/issues/4453">#4453</a>
from pypa/drop-gitignore</li>
<li><a
href="https://github.com/pypa/setuptools/commit/70cda3d1e8bb8a9602256f235c9a023934dd6065"><code>70cda3d</code></a>
Use '.yml' for consistency.</li>
<li>Additional commits viewable in <a
href="https://github.com/pypa/setuptools/compare/v70.2.0...v70.3.0">compare
view</a></li>
</ul>
</details>
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requirements.in

@@ -8,7 +8,7 @@ pyproject_hooks==1.1.0
 requests==2.32.3
 responses==0.25.3
 ruamel.yaml==0.18.6
-setuptools==70.2.0
+setuptools==70.3.0
 url-normalize==1.4.3
 urllib3==2.2.2
 validators==0.31.0