Bump pip from 23.3 to 23.3.1 (PR #6663)

Bumps [pip](https://github.com/pypa/pip) from 23.3 to 23.3.1.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/pypa/pip/blob/main/NEWS.rst">pip's changelog</a>.</em></p>
<blockquote>
<h1>23.3.1 (2023-10-21)</h1>
<h2>Bug Fixes</h2>
<ul>
<li>Handle a timezone indicator of Z when parsing dates in the self check. (<code>[#12338](pypa/pip#12338) &lt;https://github.com/pypa/pip/issues/12338&gt;</code>_)</li>
<li>Fix bug where installing the same package at the same time with multiple pip processes could fail. (<code>[#12361](pypa/pip#12361) &lt;https://github.com/pypa/pip/issues/12361&gt;</code>_)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/pypa/pip/commit/5364f26f9631dc07ed1bdfc88e1bec1bead2bce3"><code>5364f26</code></a> Bump for release</li>
<li><a href="https://github.com/pypa/pip/commit/5e7cc16c3b4442055a4a9892e9231758b6714e28"><code>5e7cc16</code></a> Fix parallel pip cache downloads causing crash (<a href="https://github.com/pypa/pip/issues/12364">#12364</a>)</li>
<li><a href="https://github.com/pypa/pip/commit/8a0f77c171d60344e6a3bf6e95ad5740c21575fd"><code>8a0f77c</code></a> Merge pull request <a href="https://github.com/pypa/pip/issues/12355">#12355</a> from sbidoul/build-using-build</li>
<li><a href="https://github.com/pypa/pip/commit/f3620cdb5be06cee223a3606a1525ee45372085b"><code>f3620cd</code></a> Merge pull request <a href="https://github.com/pypa/pip/issues/12363">#12363</a> from pfmoore/safe_isoformat</li>
<li><a href="https://github.com/pypa/pip/commit/fb06d12d5a32581ae531fc26143c14ac6c8ea8fe"><code>fb06d12</code></a> Handle ISO formats with a trailing Z</li>
<li><a href="https://github.com/pypa/pip/commit/9f213bf69ac32c60c84055261c862ff169389e43"><code>9f213bf</code></a> Merge pull request <a href="https://github.com/pypa/pip/issues/12356">#12356</a> from sbidoul/clarify-changelog</li>
<li><a href="https://github.com/pypa/pip/commit/a982c7bc3550afb27a3a792d84fe91bf7c3254ca"><code>a982c7b</code></a> Add a few PEP links in the changelog</li>
<li><a href="https://github.com/pypa/pip/commit/e1e227d7d6b5ae04ae3a2104bf8185622201f5f6"><code>e1e227d</code></a> Clarify changelog</li>
<li><a href="https://github.com/pypa/pip/commit/9b0abc8c40459dd16a9c1205e15f6d3363bf202e"><code>9b0abc8</code></a> Build using <code>build</code></li>
<li><a href="https://github.com/pypa/pip/commit/9d4be7802f45790bdb994f943c8d8731927cf25c"><code>9d4be78</code></a> Merge pull request <a href="https://github.com/pypa/pip/issues/12353">#12353</a> from sbidoul/release/23.3</li>
<li>Additional commits viewable in <a href="https://github.com/pypa/pip/compare/23.3...23.3.1">compare view</a></li>
</ul>
</details>
<br />

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changelogs/unreleased/6663-dependabot.yml

@@ -0,0 +1,5 @@
+change-type: patch
+description: Bump pip from 23.3 to 23.3.1
+destination-branches:
+- iso6
+sections: {}

requirements.txt

@@ -13,7 +13,7 @@ jinja2==3.1.2
 more-itertools==10.1.0
 netifaces==0.11.0
 packaging==23.2
-pip==23.3
+pip==23.3.1
 ply==3.11
 pydantic==1.10.13
 pyformance==0.4