Drop support for Python 3.9-3.11 to match Sphinx #189
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Alternative to #182.
Python 3.9 is only receiving security updates and is EOL in October:
https://devguide.python.org/versions/
And Sphinx itself supports 3.11+:
https://www.sphinx-doc.org/en/master/internals/release-process.html#python-version-support-policy
Because Sphinx is an application for generating docs, and not a library dependency, projects can build docs with a single (recent) Python version, even if they support the full 3.9-3.13 range.