chore(deps): bump sphinxcontrib-htmlhelp from 2.0.5 to 2.1.0 (#197)

Bumps
[sphinxcontrib-htmlhelp](https://github.com/sphinx-doc/sphinxcontrib-htmlhelp)
from 2.0.5 to 2.1.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/releases">sphinxcontrib-htmlhelp's
releases</a>.</em></p>
<blockquote>
<h2>sphinxcontrib-htmlhelp 2.1.0</h2>
<p>Changelog: <a
href="https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/blob/master/CHANGES.rst">https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/blob/master/CHANGES.rst</a></p>
<h2>sphinxcontrib-htmlhelp 2.0.6</h2>
<p>Changelog: <a
href="https://www.sphinx-doc.org/en/master/changes.html">https://www.sphinx-doc.org/en/master/changes.html</a></p>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/blob/master/CHANGES.rst">sphinxcontrib-htmlhelp's
changelog</a>.</em></p>
<blockquote>
<h1>Release 2.1.0 (2024-07-28)</h1>
<ul>
<li>Adopt Ruff</li>
<li>Tighten MyPy settings</li>
<li>Update GitHub actions versions</li>
<li>Escape HTML entities</li>
</ul>
<h1>Release 2.0.6 (2024-07-20)</h1>
<ul>
<li>Fix tests for Sphinx 7.4 and later.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/commit/f7f5d4ecf27fad97e2454fbeda94c6a105c994ff"><code>f7f5d4e</code></a>
Bump to 2.1.0</li>
<li><a
href="https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/commit/ec1353cfe396f6c28ff60f8ec7561b75a73c6b85"><code>ec1353c</code></a>
Escape HTML entities</li>
<li><a
href="https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/commit/16b26c612d157298c8254401cd6172cd03d4afe7"><code>16b26c6</code></a>
Update CHANGES links</li>
<li><a
href="https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/commit/ba51300a7ba6169291be8fdce6839c1f1531cf54"><code>ba51300</code></a>
Rename LICENSE to LICENCE.rst</li>
<li><a
href="https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/commit/b1133fa932ec75ebfb72c41ca7b5191c58eb64bc"><code>b1133fa</code></a>
Rename CHANGES to CHANGES.rst</li>
<li><a
href="https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/commit/54d27bc3930b0c250c327957764fe3bde1c449e0"><code>54d27bc</code></a>
Run CI with Python 3.12 releases</li>
<li><a
href="https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/commit/b97d63d52d6fe2b507f77caceafa54a2cacdb69a"><code>b97d63d</code></a>
Run mypy without command-line options</li>
<li><a
href="https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/commit/6d10d43e07a1ff6833bf6e2ccb58ead944cc1779"><code>6d10d43</code></a>
Fix test_htmlhelp; use the basic theme</li>
<li><a
href="https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/commit/d335658968b6e4e83852e6813778994bdf29dd4a"><code>d335658</code></a>
Use the latest GitHub actions versions</li>
<li><a
href="https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/commit/eea902567ebeb1f91a18a7a9d3397e3393889ee0"><code>eea9025</code></a>
Enable GitHub's dependabot package update service</li>
<li>Additional commits viewable in <a
href="https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/compare/2.0.5...2.1.0">compare
view</a></li>
</ul>
</details>
<br />


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docs/requirements.txt

@@ -250,9 +250,9 @@ sphinxcontrib-devhelp==1.0.6 \
  --hash=sha256:6485d09629944511c893fa11355bda18b742b83a2b181f9a009f7e500595c90f \
  --hash=sha256:9893fd3f90506bc4b97bdb977ceb8fbd823989f4316b28c3841ec128544372d3
  # via sphinx
-sphinxcontrib-htmlhelp==2.0.5 \
- --hash=sha256:0dc87637d5de53dd5eec3a6a01753b1ccf99494bd756aafecd74b4fa9e729015 \
- --hash=sha256:393f04f112b4d2f53d93448d4bce35842f62b307ccdc549ec1585e950bc35e04
+sphinxcontrib-htmlhelp==2.1.0 \
+ --hash=sha256:166759820b47002d22914d64a075ce08f4c46818e17cfc9470a9786b759b19f8 \
+ --hash=sha256:c9e2916ace8aad64cc13a0d233ee22317f2b9025b9cf3295249fa985cc7082e9
  # via sphinx
 sphinxcontrib-jsmath==1.0.1 \
  --hash=sha256:2ec2eaebfb78f3f2078e73666b1415417a116cc848b72e5172e596c871103178 \