chore(deps): bump sphinxcontrib-htmlhelp from 2.0.1 to 2.1.0

Bumps [sphinxcontrib-htmlhelp](https://github.com/sphinx-doc/sphinxcontrib-htmlhelp) from 2.0.1 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](sphinx-doc/sphinxcontrib-htmlhelp@2.0.1...2.1.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pyproject.toml

@@ -54,7 +54,7 @@ docs = [
     "sphinx-book-theme==0.3.3",
     "sphinxcontrib-applehelp==1.0.4",
     "sphinxcontrib-devhelp==1.0.2",
-    "sphinxcontrib-htmlhelp==2.0.1",
+    "sphinxcontrib-htmlhelp==2.1.0",
     "sphinxcontrib-qthelp==1.0.3",
     "sphinxcontrib-serializinghtml==1.1.5",
 ]