Update pip requirement from >=19.1.1 to >=26.0.1 (#27)

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Updates the requirements on [pip](https://github.com/pypa/pip) to permit
the latest version.
<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>26.0.1 (2026-02-04)</h1>
<h2>Bug Fixes</h2>
<ul>
<li>Fix <code>--pre</code> not being respected from the command line
when a requirement file
includes an option e.g. <code>-extra-index-url</code>.
(<code>[#13788](https://github.com/pypa/pip/issues/13788)
&lt;https://github.com/pypa/pip/issues/13788&gt;</code>_)</li>
</ul>
<h1>26.0 (2026-01-30)</h1>
<h2>Deprecations and Removals</h2>
<ul>
<li>Remove support for non-bare project names in egg fragments. Affected
users should use
the <code>Direct URL requirement syntax
&lt;https://packaging.python.org/en/latest/specifications/version-specifiers/#direct-references&gt;</code><em>.
(<code>[#13157](https://github.com/pypa/pip/issues/13157)
&lt;https://github.com/pypa/pip/issues/13157&gt;</code></em>)</li>
</ul>
<h2>Features</h2>
<ul>
<li>
<p>Display pip's command-line help in colour, if possible.
(<code>[#12134](https://github.com/pypa/pip/issues/12134)
&lt;https://github.com/pypa/pip/issues/12134&gt;</code>_)</p>
</li>
<li>
<p>Support installing dependencies declared with inline script metadata
(:pep:<code>723</code>) with <code>--requirements-from-script</code>.
(<code>[#12891](https://github.com/pypa/pip/issues/12891)
&lt;https://github.com/pypa/pip/issues/12891&gt;</code>_)</p>
</li>
<li>
<p>Add <code>--all-releases</code> and <code>--only-final</code> options
to control pre-release
and final release selection during package installation.
(<code>[#13221](https://github.com/pypa/pip/issues/13221)
&lt;https://github.com/pypa/pip/issues/13221&gt;</code>_)</p>
</li>
<li>
<p>Add <code>--uploaded-prior-to</code> option to only consider packages
uploaded prior to
a given datetime when the <code>upload-time</code> field is available
from a remote index.
(<code>[#13625](https://github.com/pypa/pip/issues/13625)
&lt;https://github.com/pypa/pip/issues/13625&gt;</code>_)</p>
</li>
<li>
<p>Add <code>--use-feature inprocess-build-deps</code> to request that
build dependencies are installed
within the same pip install process. This new mechanism is faster,
supports <code>--no-clean</code>
and <code>--no-cache-dir</code> reliably, and supports prompting for
authentication.</p>
<p>Enabling this feature will also enable <code>--use-feature
build-constraints</code>. This feature will
become the default in a future pip version.
(<code>[#9081](https://github.com/pypa/pip/issues/9081)
&lt;https://github.com/pypa/pip/issues/9081&gt;</code>_)</p>
</li>
<li>
<p><code>pip cache purge</code> and <code>pip cache remove</code> now
clean up empty directories
and legacy files left by older pip versions.
(<code>[#9058](https://github.com/pypa/pip/issues/9058)
&lt;https://github.com/pypa/pip/issues/9058&gt;</code>_)</p>
</li>
</ul>
<h2>Bug Fixes</h2>
<ul>
<li>Fix selecting pre-release versions when only pre-releases match.
For example, <code>package&gt;1.0</code> with versions <code>1.0,
2.0rc1</code> now installs
<code>2.0rc1</code> instead of failing.
(<code>[#13746](https://github.com/pypa/pip/issues/13746)
&lt;https://github.com/pypa/pip/issues/13746&gt;</code>_)</li>
<li>Revisions in version control URLs now must be percent-encoded.
For example, use <code>git+https://example.com/repo.git@issue%231</code>
to specify the branch <code>issue#1</code>.
If you previously used a branch name containing a <code>%</code>
character in a version control URL, you now need to replace it with
<code>%25</code> to ensure correct percent-encoding.
(<code>[#13407](https://github.com/pypa/pip/issues/13407)
&lt;https://github.com/pypa/pip/issues/13407&gt;</code>_)</li>
<li>Preserve original casing when a path is displayed.
(<code>[#6823](https://github.com/pypa/pip/issues/6823)
&lt;https://github.com/pypa/pip/issues/6823&gt;</code>_)</li>
<li>Fix bash completion when the <code>$IFS</code> variable has been
modified from its default.
(<code>[#13555](https://github.com/pypa/pip/issues/13555)
&lt;https://github.com/pypa/pip/issues/13555&gt;</code>_)</li>
<li>Precompute Python requirements on each candidate, reducing time of
long resolutions.
(<code>[#13656](https://github.com/pypa/pip/issues/13656)
&lt;https://github.com/pypa/pip/issues/13656&gt;</code>_)</li>
<li>Skip redundant work converting version objects to strings when using
the</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/pypa/pip/commit/5fe4ea4f24cd9756316a4b5ef05daa15d84f7d0c"><code>5fe4ea4</code></a>
Bump for release</li>
<li><a
href="https://github.com/pypa/pip/commit/bea3cbe3b4d637be6d5007e9a5a2327e500b00d8"><code>bea3cbe</code></a>
windows fix tests</li>
<li><a
href="https://github.com/pypa/pip/commit/ed22252bd19a71ce351b84405fa23230ca45ceea"><code>ed22252</code></a>
News Entry</li>
<li><a
href="https://github.com/pypa/pip/commit/af1327407f048bd2310b8b633f8e8a4e41c38d2c"><code>af13274</code></a>
Match release control behavior to the same as format control
behavior</li>
<li><a
href="https://github.com/pypa/pip/commit/2f4d4a836ed00076001376fbb0ce6dc4f22cdae2"><code>2f4d4a8</code></a>
Merge pull request <a
href="https://redirect.github.com/pypa/pip/issues/13779">#13779</a> from
notatallshaw/fix-26.0-news</li>
<li><a
href="https://github.com/pypa/pip/commit/04307a42261749cfa1c86a5537ad88f44ed2a41a"><code>04307a4</code></a>
fix 26.0 news</li>
<li><a
href="https://github.com/pypa/pip/commit/6ec7b0a488f614a7632442fe7c651957fdb5fc85"><code>6ec7b0a</code></a>
Merge pull request <a
href="https://redirect.github.com/pypa/pip/issues/13775">#13775</a> from
notatallshaw/release/26.0</li>
<li><a
href="https://github.com/pypa/pip/commit/4104356cd83d1614af45d203d64cb84705dad9d2"><code>4104356</code></a>
Bump for release</li>
<li><a
href="https://github.com/pypa/pip/commit/58be8836b68814295d33bc5c56c38d3a0659ae81"><code>58be883</code></a>
Update AUTHORS.txt</li>
<li><a
href="https://github.com/pypa/pip/commit/66f2dece5ba9cc0ee9fe7035c46ba4b0756559b5"><code>66f2dec</code></a>
Merge pull request <a
href="https://redirect.github.com/pypa/pip/issues/13778">#13778</a> from
ichard26/docs/groups</li>
<li>Additional commits viewable in <a
href="https://github.com/pypa/pip/compare/19.1.1...26.0.1">compare
view</a></li>
</ul>
</details>
<br />

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