⬆️ Support Sphinx v9 #1949

Job	Run time
Check myst-docutils install (0.20)	17s
Check myst-docutils install (0.21)	12s
pre-commit	16s
pytest: py3.13, sphinx>=9,<10, on ubuntu-latest	37s
pytest: py3.11, sphinx>=8,<9, on ubuntu-latest	32s
pytest: py3.12, sphinx>=8,<9, on ubuntu-latest	33s
pytest: py3.11, sphinx>=9,<10, on ubuntu-latest	35s
pytest: py3.14, sphinx>=8,<9, on ubuntu-latest	31s
pytest: py3.14, sphinx>=9,<10, on ubuntu-latest	35s
pytest: py3.13, sphinx>=8,<9, on ubuntu-latest	35s
pytest: py3.14, sphinx>=9,<10, on windows-latest	1m 2s
pytest: py3.12, sphinx>=9,<10, on ubuntu-latest	33s
pytest: py3.11, sphinx>=8,<9, on windows-latest	1m 24s
check	2s
Publish myst-parser to PyPi	-1s
Publish myst-docutils to PyPi	0s
	7m 43s

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