⬆️ Support Sphinx v9 #1928

Job	Run time
Check myst-docutils install (0.21)	12s
Check myst-docutils install (0.20)	13s
pre-commit	16s
pytest: py3.14, sphinx>=9,<10, on ubuntu-latest	32s
pytest: py3.11, sphinx>=8,<9, on ubuntu-latest	36s
pytest: py3.13, sphinx>=8,<9, on ubuntu-latest	33s
pytest: py3.11, sphinx>=8,<9, on windows-latest	1m 25s
pytest: py3.11, sphinx>=9,<10, on ubuntu-latest	36s
pytest: py3.13, sphinx>=9,<10, on ubuntu-latest	36s
pytest: py3.12, sphinx>=8,<9, on ubuntu-latest	37s
pytest: py3.12, sphinx>=9,<10, on ubuntu-latest	33s
pytest: py3.14, sphinx>=9,<10, on windows-latest	2m 10s
pytest: py3.14, sphinx>=8,<9, on ubuntu-latest	29s
check	5s
Publish myst-parser to PyPi	0s
Publish myst-docutils to PyPi	0s
	8m 53s

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