⬆️ Bump urllib3 from 1.26.15 to 1.26.16 (#359)

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.15 to
1.26.16.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/urllib3/urllib3/releases">urllib3's
releases</a>.</em></p>
<blockquote>
<h2>1.26.16</h2>
<ul>
<li>Fixed thread-safety issue where accessing a <code>PoolManager</code>
with many distinct origins would cause connection pools to be closed
while requests are in progress (<a
href="https://redirect.github.com/urllib3/urllib3/issues/2954">#2954</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/urllib3/urllib3/blob/main/CHANGES.rst">urllib3's
changelog</a>.</em></p>
<blockquote>
<h1>1.26.16 (2023-05-23)</h1>
<ul>
<li>Fixed thread-safety issue where accessing a <code>PoolManager</code>
with many distinct origins
would cause connection pools to be closed while requests are in progress
(<code>[#2954](urllib3/urllib3#2954)
&lt;https://github.com/urllib3/urllib3/pull/2954&gt;</code>_)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/urllib3/urllib3/commit/d94029b7e2193ff47b627906a70e06377a09aae8"><code>d94029b</code></a>
Release 1.26.16</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/18e92145e9cddbabdf51c98f54202aa37fd5d4c8"><code>18e9214</code></a>
Use trusted publishing for PyPI</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/d25cf83bbae850a290fe34ed1610ae55c0558b36"><code>d25cf83</code></a>
[1.26] Fix invalid test_ssl_failure_midway_through_conn</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/25cca389496b86ee809c21e5b641aeaa74809263"><code>25cca38</code></a>
[1.26] Fix test_ssl_object_attributes</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/bbea166e946ff5bf1411c1827e1d92566be59cb1"><code>bbea166</code></a>
[1.26] Fix pypy2.7 CI</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/710114d7810558fd7e224054a566b53bb8601494"><code>710114d</code></a>
[1.26] Don't close ConnectionPools from PoolManager until
unreferenced</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/6b77c3975719e403a1d28ddf0d3ff8377814ab14"><code>6b77c39</code></a>
[1.26] pin virtualenv to &lt;20.22.0 for python-version==2.7</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/cdb8a7d6902418d214e67b3a8b0d854e460e2c49"><code>cdb8a7d</code></a>
[1.26] Fix compatible Python versions in v2-roadmap.rst (<a
href="https://redirect.github.com/urllib3/urllib3/issues/2979">#2979</a>)</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/0dfbb254cc4f9a8b1d0912f6b08e8ef03f2ca4f0"><code>0dfbb25</code></a>
[1.26] Bump Ubuntu version in integration tests</li>
<li><a
href="https://github.com/urllib3/urllib3/commit/f50c0d03c2b8cc20b0be7fa2fb7a01e15b7b0313"><code>f50c0d0</code></a>
[1.26] Fix isort pre-commit installation</li>
<li>Additional commits viewable in <a
href="https://github.com/urllib3/urllib3/compare/1.26.15...1.26.16">compare
view</a></li>
</ul>
</details>
<br />


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requirements.txt

@@ -286,7 +286,7 @@ typing-extensions==4.5.0
     #   myst-parser
 unidecode==1.3.6
     # via sphinx-autoapi
-urllib3==1.26.15
+urllib3==1.26.16
     # via requests
 virtualenv==20.21.0
     # via pre-commit