Python: Update websockets requirement from <15,>=13 to >=13,<16 in /python (#11016)

Updates the requirements on
[websockets](https://github.com/python-websockets/websockets) to permit
the latest version.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/python-websockets/websockets/releases">websockets's
releases</a>.</em></p>
<blockquote>
<h2>15.0.1</h2>
<p>See <a
href="https://websockets.readthedocs.io/en/stable/project/changelog.html">https://websockets.readthedocs.io/en/stable/project/changelog.html</a>
for details.</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/python-websockets/websockets/commit/37c9bc0781f0cc5af7c729947ef1833c1e12b70d"><code>37c9bc0</code></a>
Release version 15.0.1.</li>
<li><a
href="https://github.com/python-websockets/websockets/commit/fce02abb7843bbbad78a53ec0740620dc183ff45"><code>fce02ab</code></a>
Docs. Correct Producer pattern example.</li>
<li><a
href="https://github.com/python-websockets/websockets/commit/5fa24bbb4aa5e0ee4dcc2cf1ce186f3ab68349a6"><code>5fa24bb</code></a>
Exit cleanly the interactive client on ^C.</li>
<li><a
href="https://github.com/python-websockets/websockets/commit/d0e60d319f95cfab19ac027410dbf07799c76c1d"><code>d0e60d3</code></a>
Remove spurious PYTHONPATH declarations.</li>
<li><a
href="https://github.com/python-websockets/websockets/commit/d7dafcc95a7b0277cb06d67024fab024045e9de9"><code>d7dafcc</code></a>
Add test coverage for interactive client.</li>
<li><a
href="https://github.com/python-websockets/websockets/commit/3c62503261f899ebd6f0cdbb6222d8052f842ef2"><code>3c62503</code></a>
Use entrypoint instead of runpy in docs.</li>
<li><a
href="https://github.com/python-websockets/websockets/commit/f4e4345b7a39a5275dbdf92d1ccc64383a19ca35"><code>f4e4345</code></a>
added entry point script for the cli client in the pyproject.toml</li>
<li><a
href="https://github.com/python-websockets/websockets/commit/6f89bacb0754d4f541d70d1444f7bd9eac69ba60"><code>6f89bac</code></a>
Start version 15.1.</li>
<li><a
href="https://github.com/python-websockets/websockets/commit/7ac73c645329055a3c352077b8055e6ed65fa46c"><code>7ac73c6</code></a>
Release version 15.0.</li>
<li><a
href="https://github.com/python-websockets/websockets/commit/a1ba01db142459db0ea6f7659b3a5f4962749fa6"><code>a1ba01d</code></a>
Rewrite interactive client (again) without threads.</li>
<li>Additional commits viewable in <a
href="https://github.com/python-websockets/websockets/compare/13.0...15.0.1">compare
view</a></li>
</ul>
</details>
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python/pyproject.toml

@@ -48,7 +48,7 @@ dependencies = [
     "jinja2 ~= 3.1",
     "nest-asyncio ~= 1.6",
     "scipy>=1.15.1",
-    "websockets >= 13, < 15",
+    "websockets >= 13, < 16",
     "aiortc>=1.9.0",
 ]