chore(deps): Update dependency sphinxcontrib.serializinghtml to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
sphinxcontrib.serializinghtml (changelog)	==1.1.5 -> ==2.0.0

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Release Notes

sphinx-doc/sphinxcontrib-serializinghtml (sphinxcontrib.serializinghtml)

v2.0.0

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• Adopt Ruff
• Tighten MyPy settings
• Update GitHub actions versions

v1.1.10

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• Remove Sphinx as a required dependency, as circular dependencies may cause
  failure with package managers that expect a directed acyclic graph (DAG)
  of dependencies.

v1.1.9

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• Serialise context["script_files"] and context["css_files"] as their filenames
  on Sphinx 7.2.0.

v1.1.8

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• Use os.PathLike over pathlib.Path

v1.1.7

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• Fix tests for Sphinx 7.1 and below

v1.1.6

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• Drop support for Python 3.5, 3.6, 3.7, and 3.8
• Raise minimum required Sphinx version to 5.0

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