Bump sphinxcontrib-htmlhelp from 2.0.5 to 2.1.0 in /requirements (#22515)

Bumps [sphinxcontrib-htmlhelp](https://github.com/sphinx-doc/sphinxcontrib-htmlhelp) from 2.0.5 to 2.1.0.
- [Release notes](https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/releases)
- [Changelog](https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/blob/master/CHANGES.rst)
- [Commits](https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/compare/2.0.5...2.1.0)

---
updated-dependencies:
- dependency-name: sphinxcontrib-htmlhelp
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements/dev.txt

@@ -77,9 +77,9 @@ sphinxcontrib.jquery==4.1 \
 sphinxcontrib-jsmath==1.0.1 \
     --hash=sha256:2ec2eaebfb78f3f2078e73666b1415417a116cc848b72e5172e596c871103178 \
     --hash=sha256:a9925e4a4587247ed2191a22df5f6970656cb8ca2bd6284309578f2153e0c4b8
-sphinxcontrib-htmlhelp==2.0.5 \
-    --hash=sha256:0dc87637d5de53dd5eec3a6a01753b1ccf99494bd756aafecd74b4fa9e729015 \
-    --hash=sha256:393f04f112b4d2f53d93448d4bce35842f62b307ccdc549ec1585e950bc35e04
+sphinxcontrib-htmlhelp==2.1.0 \
+    --hash=sha256:166759820b47002d22914d64a075ce08f4c46818e17cfc9470a9786b759b19f8 \
+    --hash=sha256:c9e2916ace8aad64cc13a0d233ee22317f2b9025b9cf3295249fa985cc7082e9
 sphinxcontrib-qthelp==1.0.7 \
     --hash=sha256:053dedc38823a80a7209a80860b16b722e9e0209e32fea98c90e4e6624588ed6 \
     --hash=sha256:e2ae3b5c492d58fcbd73281fbd27e34b8393ec34a073c792642cd8e529288182