build(deps): update dependency sphinxcontrib-htmlhelp to v2.1.0 (main)

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sphinxcontrib-htmlhelp (changelog)	==2.0.5 -> ==2.1.0

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Release Notes

sphinx-doc/sphinxcontrib-htmlhelp (sphinxcontrib-htmlhelp)

### [`v2.1.0`](https://redirect.github.com/sphinx-doc/sphinxcontrib-htmlhelp/blob/HEAD/CHANGES.rst#Release-210-2024-07-28) [Compare Source](https://redirect.github.com/sphinx-doc/sphinxcontrib-htmlhelp/compare/2.0.6...2.1.0) \========================== - Adopt Ruff - Tighten MyPy settings - Update GitHub actions versions - Escape HTML entities ### [`v2.0.6`](https://redirect.github.com/sphinx-doc/sphinxcontrib-htmlhelp/blob/HEAD/CHANGES.rst#Release-206-2024-07-20) [Compare Source](https://redirect.github.com/sphinx-doc/sphinxcontrib-htmlhelp/compare/2.0.5...2.0.6) \========================== - Fix tests for Sphinx 7.4 and later.

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