chore(deps): Bump flask from 3.1.0 to 3.1.1 in /experimenter/tests (#12629)

Bumps [flask](https://github.com/pallets/flask) from 3.1.0 to 3.1.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/pallets/flask/releases">flask's
releases</a>.</em></p>
<blockquote>
<h2>3.1.1</h2>
<p>This is the Flask 3.1.1 fix release, which fixes bugs but does not
otherwise change behavior and should not result in breaking changes
compared to the latest feature release.</p>
<p>PyPI: <a
href="https://pypi.org/project/Flask/3.1.1/">https://pypi.org/project/Flask/3.1.1/</a>
Changes: <a
href="https://flask.palletsprojects.com/en/stable/changes/#version-3-1-1">https://flask.palletsprojects.com/en/stable/changes/#version-3-1-1</a>
Milestone <a
href="https://github.com/pallets/flask/milestone/36?closed=1">https://github.com/pallets/flask/milestone/36?closed=1</a></p>
<ul>
<li>Fix signing key selection order when key rotation is enabled via
<code>SECRET_KEY_FALLBACKS</code>. GHSA-4grg-w6v8-c28g</li>
<li>Fix type hint for <code>cli_runner.invoke</code>. <a
href="https://redirect.github.com/pallets/flask/issues/5645">#5645</a></li>
<li><code>flask --help</code> loads the app and plugins first to make
sure all commands are shown. <a
href="https://redirect.github.com/pallets/flask/issues/5673">#5673</a></li>
<li>Mark sans-io base class as being able to handle views that return
<code>AsyncIterable</code>. This is not accurate for Flask, but makes
typing easier for Quart. <a
href="https://redirect.github.com/pallets/flask/issues/5659">#5659</a></li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/pallets/flask/blob/main/CHANGES.rst">flask's
changelog</a>.</em></p>
<blockquote>
<h2>Version 3.1.1</h2>
<p>Released 2025-05-13</p>
<ul>
<li>Fix signing key selection order when key rotation is enabled via
<code>SECRET_KEY_FALLBACKS</code>.
:ghsa:<code>4grg-w6v8-c28g</code></li>
<li>Fix type hint for <code>cli_runner.invoke</code>.
:issue:<code>5645</code></li>
<li><code>flask --help</code> loads the app and plugins first to make
sure all commands
are shown. :issue:<code>5673</code></li>
<li>Mark sans-io base class as being able to handle views that return
<code>AsyncIterable</code>. This is not accurate for Flask, but makes
typing easier
for Quart. :pr:<code>5659</code></li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/pallets/flask/commit/7fff56f5172c48b6f3aedf17ee14ef5c2533dfd1"><code>7fff56f</code></a>
release version 3.1.1</li>
<li><a
href="https://github.com/pallets/flask/commit/73d6504063bfa00666a92b07a28aaf906c532f09"><code>73d6504</code></a>
Merge commit from fork</li>
<li><a
href="https://github.com/pallets/flask/commit/cbb6c36692f7d882e9026597624c0eb38e01f9cb"><code>cbb6c36</code></a>
update docs about fallback order</li>
<li><a
href="https://github.com/pallets/flask/commit/fb54159861708558b5f5658ebdc14709d984361c"><code>fb54159</code></a>
secret key rotation: fix key list ordering</li>
<li><a
href="https://github.com/pallets/flask/commit/941efd4a36ed0f27e13758874f95e3aa1d3ee163"><code>941efd4</code></a>
use uv (<a
href="https://redirect.github.com/pallets/flask/issues/5727">#5727</a>)</li>
<li><a
href="https://github.com/pallets/flask/commit/0109e496f6ca68de29480fe6413e81b1d3f86aa9"><code>0109e49</code></a>
use uv</li>
<li><a
href="https://github.com/pallets/flask/commit/e7851665071cb93b3c70b1e7103f82d1e6d01f5d"><code>e785166</code></a>
Async Iterable Response (<a
href="https://redirect.github.com/pallets/flask/issues/5659">#5659</a>)</li>
<li><a
href="https://github.com/pallets/flask/commit/410e5ab7ed0ef326fa8b5164a633863f137ffff5"><code>410e5ab</code></a>
Accept <code>AsyncIterable</code> for responses</li>
<li><a
href="https://github.com/pallets/flask/commit/bfffe87d4c2ea255b9a51432bebb3d28741245c4"><code>bfffe87</code></a>
add ghsa links</li>
<li><a
href="https://github.com/pallets/flask/commit/73ce26c3e822cdc2ccf99625619a50c91f163f8d"><code>73ce26c</code></a>
remove tests about deprecated pkgutil.get_loader (<a
href="https://redirect.github.com/pallets/flask/issues/5702">#5702</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/pallets/flask/compare/3.1.0...3.1.1">compare
view</a></li>
</ul>
</details>
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experimenter/tests/poetry.lock

@@ -61,7 +61,7 @@ wrapt = "^1.17.0"
 pytest-rerunfailures = "^14.0"
 setuptools = "^70.3.0"
 dataclasses-json = "^0.6.7"
-flask = "^3.1.0"
+flask = "^3.1.1"
 pytest-repeat = "^0.9.4"