⬆️ Support Sphinx v9 #1946

Job	Run time
Check myst-docutils install (0.20)	14s
Check myst-docutils install (0.21)	14s
pre-commit	15s
pytest: py3.14, sphinx>=9,<10, on ubuntu-latest	32s
pytest: py3.11, sphinx>=8,<9, on ubuntu-latest	33s
pytest: py3.11, sphinx>=9,<10, on ubuntu-latest	27s
pytest: py3.11, sphinx>=8,<9, on windows-latest	1m 34s
pytest: py3.12, sphinx>=8,<9, on ubuntu-latest	36s
pytest: py3.13, sphinx>=9,<10, on ubuntu-latest	33s
pytest: py3.12, sphinx>=9,<10, on ubuntu-latest	36s
pytest: py3.13, sphinx>=8,<9, on ubuntu-latest	37s
pytest: py3.14, sphinx>=9,<10, on windows-latest	1m 27s
pytest: py3.14, sphinx>=8,<9, on ubuntu-latest	28s
check	4s
Publish myst-parser to PyPi	0s
Publish myst-docutils to PyPi	0s
	8m 10s

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