chore(deps): bump pip from 24.3.1 to 25.3 in /etc/loadtests/locust in the pip group across 1 directory

Bumps the pip group with 1 update in the /etc/loadtests/locust directory: [pip](https://github.com/pypa/pip).

Updates `pip` from 24.3.1 to 25.3
<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>25.3 (2025-10-24)</h1>
<h2>Deprecations and Removals</h2>
<ul>
<li>
<p>Remove support for the legacy <code>setup.py develop</code> editable method in setuptools
editable installs; setuptools &gt;= 64 is now required. (<code>[#11457](pypa/pip#11457) &lt;https://github.com/pypa/pip/issues/11457&gt;</code>_)</p>
</li>
<li>
<p>Remove the deprecated <code>--global-option</code> and <code>--build-option</code>.
<code>--config-setting</code> is now the only way to pass options to the build backend. (<code>[#11859](pypa/pip#11859) &lt;https://github.com/pypa/pip/issues/11859&gt;</code>_)</p>
</li>
<li>
<p>Deprecate the <code>PIP_CONSTRAINT</code> environment variable for specifying build
constraints.</p>
<p>Use the <code>--build-constraint</code> option or the <code>PIP_BUILD_CONSTRAINT</code> environment variable
instead. When build constraints are used, <code>PIP_CONSTRAINT</code> no longer affects isolated build
environments. To enable this behavior without specifying any build constraints, use
<code>--use-feature=build-constraint</code>. (<code>[#13534](pypa/pip#13534) &lt;https://github.com/pypa/pip/issues/13534&gt;</code>_)</p>
</li>
<li>
<p>Remove support for non-standard legacy wheel filenames. (<code>[#13581](pypa/pip#13581) &lt;https://github.com/pypa/pip/issues/13581&gt;</code>_)</p>
</li>
<li>
<p>Remove support for the deprecated <code>setup.py bdist_wheel</code> mechanism. Consequently,
<code>--use-pep517</code> is now always on, and <code>--no-use-pep517</code> has been removed. (<code>[#6334](pypa/pip#6334) &lt;https://github.com/pypa/pip/issues/6334&gt;</code>_)</p>
</li>
</ul>
<h2>Features</h2>
<ul>
<li>When :pep:<code>658</code> metadata is available, full distribution files are no longer downloaded when using <code>pip lock</code> or <code>pip install --dry-run</code>. (<code>[#12603](pypa/pip#12603) &lt;https://github.com/pypa/pip/issues/12603&gt;</code>_)</li>
<li>Add support for installing an editable requirement written as a Direct URL (<code>PackageName @ URL</code>). (<code>[#13495](pypa/pip#13495) &lt;https://github.com/pypa/pip/issues/13495&gt;</code>_)</li>
<li>Add support for build constraints via the <code>--build-constraint</code> option. This
allows constraining the versions of packages used during the build process
(e.g., setuptools) without affecting the final installation. (<code>[#13534](pypa/pip#13534) &lt;https://github.com/pypa/pip/issues/13534&gt;</code>_)</li>
<li>On <code>ResolutionImpossible</code> errors, include a note about causes with no candidates. (<code>[#13588](pypa/pip#13588) &lt;https://github.com/pypa/pip/issues/13588&gt;</code>_)</li>
<li>Building pip itself from source now uses flit-core instead of setuptools.
This does not affect how pip installs or builds packages you use. (<code>[#13473](pypa/pip#13473) &lt;https://github.com/pypa/pip/issues/13473&gt;</code>_)</li>
</ul>
<h2>Bug Fixes</h2>
<ul>
<li>Handle malformed <code>Version</code> metadata entries and
show a sensible error message instead of crashing. (<code>[#13443](pypa/pip#13443) &lt;https://github.com/pypa/pip/issues/13443&gt;</code>_)</li>
<li>Permit spaces between a filepath and extras in an install requirement. (<code>[#13523](pypa/pip#13523) &lt;https://github.com/pypa/pip/issues/13523&gt;</code>_)</li>
<li>Ensure the self-check files in the cache have the same permissions as the rest of the cache. (<code>[#13528](pypa/pip#13528) &lt;https://github.com/pypa/pip/issues/13528&gt;</code>_)</li>
<li>Avoid concurrency issues and improve performance when caching locally built wheels,
especially when the temporary build directory is on a different filesystem than the cache.
The wheel directory passed to the build backend is now a temporary subdirectory inside
the cache directory. (<code>[#13540](pypa/pip#13540) &lt;https://github.com/pypa/pip/issues/13540&gt;</code>_)</li>
<li>Include relevant user-supplied constraints in logs when reporting dependency conflicts. (<code>[#13545](pypa/pip#13545) &lt;https://github.com/pypa/pip/issues/13545&gt;</code>_)</li>
<li>Fix a regression in configuration parsing that was turning a single value
into a list and thus leading to a validation error. (<code>[#13548](pypa/pip#13548) &lt;https://github.com/pypa/pip/issues/13548&gt;</code>_)</li>
<li>For Python versions that do not support :pep:<code>706</code>, pip will now raise an installation error for a
source distribution when it includes a symlink that points outside the source distribution archive. (<code>[#13550](pypa/pip#13550) &lt;https://github.com/pypa/pip/issues/13550&gt;</code>_)</li>
<li>Prevent <code>--user</code> installs if <code>site.ENABLE_USER_SITE</code> is set to <code>False</code>. (<code>[#8794](pypa/pip#8794) &lt;https://github.com/pypa/pip/issues/8794&gt;</code>_)</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/pypa/pip/commit/a52069365063ea813fe3a3f8bac90397c9426d35"><code>a520693</code></a> Bump for release</li>
<li><a href="https://github.com/pypa/pip/commit/0f2973eded07de7fcfe90d494763821172bc2c5f"><code>0f2973e</code></a> Fix up authors by adding entry to <code>.mailmap</code></li>
<li><a href="https://github.com/pypa/pip/commit/87828dc11b18b657d95fed4dc4ed996ba032e4f8"><code>87828dc</code></a> Update AUTHORS.txt</li>
<li><a href="https://github.com/pypa/pip/commit/ce6a38ce06886f1f711226600a5b002df1b70453"><code>ce6a38c</code></a> Merge pull request <a href="https://redirect.github.com/pypa/pip/issues/13628">#13628</a> from sbidoul/imp-doc-pep517-sbi</li>
<li><a href="https://github.com/pypa/pip/commit/ee16c815eb52190a3ffa6d9e19e7dac78a0a0c3e"><code>ee16c81</code></a> Merge pull request <a href="https://redirect.github.com/pypa/pip/issues/13629">#13629</a> from notatallshaw/bump-gone_in=&quot;25.3&quot;</li>
<li><a href="https://github.com/pypa/pip/commit/3e227aafbfe5c464ce9f2fb72c446e29692ea6c2"><code>3e227aa</code></a> Bump gone_in=&quot;25.3&quot;</li>
<li><a href="https://github.com/pypa/pip/commit/4ad18287837da0bc52feb8dce03f604809395e3b"><code>4ad1828</code></a> Merge pull request <a href="https://redirect.github.com/pypa/pip/issues/13495">#13495</a> from ichard26/feat/direct-editables</li>
<li><a href="https://github.com/pypa/pip/commit/66ded3b043ae3e25d761ee092c1add0d98c9e4bf"><code>66ded3b</code></a> Merge pull request <a href="https://redirect.github.com/pypa/pip/issues/13570">#13570</a> from ShubhamNagure/fix-constraint-reporting-13545</li>
<li><a href="https://github.com/pypa/pip/commit/67e8ac2fc9002bfec8d371ecbe1a8813c64b68e9"><code>67e8ac2</code></a> Merge pull request <a href="https://redirect.github.com/pypa/pip/issues/13588">#13588</a> from notatallshaw/hint-on-resolution-impossible-whe...</li>
<li><a href="https://github.com/pypa/pip/commit/990ca8a45149ea8980bd82699471fbabeeeec18c"><code>990ca8a</code></a> Merge pull request <a href="https://redirect.github.com/pypa/pip/issues/8796">#8796</a> from pelson/honour_user_site</li>
<li>Additional commits viewable in <a href="https://github.com/pypa/pip/compare/24.3.1...25.3">compare view</a></li>
</ul>
</details>
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Author: dependabot[bot]

etc/loadtests/locust/requirements.txt

@@ -10,7 +10,7 @@ locust==2.32.3
 MarkupSafe==3.0.2
 msgpack-python==0.5.6
 pyzmq==26.2.0
-pip==24.3.1
+pip==25.3
 six==1.16.0
 setuptools==78.1.1
 requests==2.32.4