Bump pip from 26.1 to 26.1.1 (#12460)

Bumps [pip](https://github.com/pypa/pip) from 26.1 to 26.1.1.
<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>26.1.1 (2026-05-04)</h1>
<h2>Bug Fixes</h2>
<ul>
<li>Fix issue where uninstallation left behind empty directories. Revert
the
removal of the adjacent <code>__pycache__</code> directory when a .py
file is removed.
(<code>[#13973](pypa/pip#13973)
&lt;https://github.com/pypa/pip/issues/13973&gt;</code>_)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/pypa/pip/commit/4432a371c6471e6a93c3eb39b3e9ab2b876b13b9"><code>4432a37</code></a>
Bump for release</li>
<li><a
href="https://github.com/pypa/pip/commit/4943e17e7dd079b3f58e88009d10308f2c55a3ed"><code>4943e17</code></a>
Merge pull request <a
href="https://redirect.github.com/pypa/pip/issues/13973">#13973</a> from
pypa/revert-13725-vfazio-remove-all-optimizati...</li>
<li><a
href="https://github.com/pypa/pip/commit/e9e7b90f35bfcd3c9e4ff93e0f0cc1b90f59aa68"><code>e9e7b90</code></a>
Add news</li>
<li><a
href="https://github.com/pypa/pip/commit/0ff696479aa07ea5ca78b08d205ae23854b6e0e8"><code>0ff6964</code></a>
Revert &quot;Remove <strong>pycache</strong> when package is
removed&quot;</li>
<li><a
href="https://github.com/pypa/pip/commit/cc6b082d6b9350d96c5a24337b12b7a42846c410"><code>cc6b082</code></a>
Merge pull request <a
href="https://redirect.github.com/pypa/pip/issues/13951">#13951</a> from
sbidoul/release/26.1</li>
<li><a
href="https://github.com/pypa/pip/commit/b2671f1cb340f33db300f0bffc062402bce3eca0"><code>b2671f1</code></a>
Bump for development</li>
<li>See full diff in <a
href="https://github.com/pypa/pip/compare/26.1...26.1.1">compare
view</a></li>
</ul>
</details>
<br />


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requirements/constraints.txt

@@ -295,7 +295,7 @@ zlib-ng==1.0.0
     #   -r requirements/test-common.in
 
 # The following packages are considered to be unsafe in a requirements file:
-pip==26.1
+pip==26.1.1
     # via pip-tools
 setuptools==82.0.1
     # via pip-tools

requirements/dev.txt

@@ -285,7 +285,7 @@ zlib-ng==1.0.0
     #   -r requirements/test-common.in
 
 # The following packages are considered to be unsafe in a requirements file:
-pip==26.1
+pip==26.1.1
     # via pip-tools
 setuptools==82.0.1
     # via pip-tools