Bump gunicorn from 21.0.1 to 21.2.0 (#419)

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 21.0.1 to
21.2.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/benoitc/gunicorn/releases">gunicorn's
releases</a>.</em></p>
<blockquote>
<h2>Gunicorn 21.2.0 has been released</h2>
<p><strong>Gunicorn 21.2.0 has been released.</strong> This version fix
the issue introduced in the threaded worker.</p>
<p>Changes:</p>
<pre><code>21.2.0 - 2023-07-19
===================
fix thread worker: revert change considering connection as idle .
<p>*** NOTE ***</p>
<p>This is fixing the bad file description error.
</code></pre></p>
<ol>
<li>Documentation is available there: <a
href="https://docs.gunicorn.org/en/stable/news.html">https://docs.gunicorn.org/en/stable/news.html</a></li>
<li>Packages: <a
href="https://pypi.org/project/gunicorn/">https://pypi.org/project/gunicorn/</a></li>
</ol>
<h2>Gunicorn 21.1.0 has been released</h2>
<p>gunicorn 21.1.0 has been released. This version fix the issue
introduced in the threaded worker.</p>
<h1>21.1.0 - 2023-07-18</h1>
<ul>
<li>fix thread worker: fix socket removal from the queuet checkout
21.x</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/benoitc/gunicorn/commit/ab9c8301cb9ae573ba597154ddeea16f0326fc15"><code>ab9c830</code></a>
bump to 21.2.0</li>
<li><a
href="https://github.com/benoitc/gunicorn/commit/f5669f64750bb5cbaaf80c53a56408d1530748e0"><code>f5669f6</code></a>
Merge pull request <a
href="https://redirect.github.com/benoitc/gunicorn/issues/3033">#3033</a>
from benoitc/fix-gthread</li>
<li><a
href="https://github.com/benoitc/gunicorn/commit/bc905859a604a73dd2626b07cf12621f3ef36716"><code>bc90585</code></a>
revert change considering connection as idle</li>
<li><a
href="https://github.com/benoitc/gunicorn/commit/4e12ebe3342a52547cc764676975a0d488e98b6f"><code>4e12ebe</code></a>
bump to 21.1.0</li>
<li><a
href="https://github.com/benoitc/gunicorn/commit/60b78e3d98030383b36a2b78fe599b9c241ca5f7"><code>60b78e3</code></a>
fix setup.cfg: use new license_files property</li>
<li><a
href="https://github.com/benoitc/gunicorn/commit/83c3973e1b2de37614ffebebb93c5f0a85675411"><code>83c3973</code></a>
Merge pull request <a
href="https://redirect.github.com/benoitc/gunicorn/issues/3030">#3030</a>
from benoitc/fix-ghthread</li>
<li><a
href="https://github.com/benoitc/gunicorn/commit/86d85cb3699c41a2c958c604344b62022e5a4c38"><code>86d85cb</code></a>
fix gthread worker</li>
<li>See full diff in <a
href="https://github.com/benoitc/gunicorn/compare/21.0.1...21.2.0">compare
view</a></li>
</ul>
</details>
<br />


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requirements.txt

@@ -7,7 +7,7 @@ click==8.1.3
 colorama==0.4.6
 dill==0.3.6
 Flask==2.3.2
-gunicorn==21.0.1
+gunicorn==21.2.0
 idna==3.4
 importlib-metadata==6.7.0
 isort==5.12.0