⬆️ Add Sphinx 9 support #670

Job	Run time
pre-commit	12s
docs-build-format (html)	17s
docs-build-format (latex)	24s
docs-build-format (man)	11s
Tests (py3.12, Sphinx~=7.0, on ubuntu-latest)	46s
Tests (py3.11, Sphinx~=7.0, on ubuntu-latest)	40s
Tests (py3.13, Sphinx~=9.0, on ubuntu-latest)	39s
Tests (py3.11, Sphinx~=8.0, on ubuntu-latest)	32s
Tests (py3.11, Sphinx~=9.0, on ubuntu-latest)	32s
Tests (py3.12, Sphinx~=8.0, on ubuntu-latest)	36s
Tests (py3.12, Sphinx~=9.0, on ubuntu-latest)	40s
Tests (py3.14, Sphinx~=7.0, on ubuntu-latest)	34s
Tests (py3.13, Sphinx~=7.0, on ubuntu-latest)	46s
Tests (py3.13, Sphinx~=8.0, on ubuntu-latest)	47s
Tests (py3.11, Sphinx~=7.0, on windows-latest)	2m 31s
Tests (py3.14, Sphinx~=9.0, on windows-latest)	1m 13s
Tests (py3.14, Sphinx~=8.0, on ubuntu-latest)	28s
Tests (py3.14, Sphinx~=9.0, on ubuntu-latest)	33s
Tests (py3.13, Sphinx~=8.0, on windows-latest)	1m 24s
check	5s
Publish to PyPi	0s
	13m 50s

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