⬆️ Update pygments requirement from <2.19 to <2.20 (#1014) #1894

Job	Run time
pre-commit	20s
pytest: py3.13, sphinx>=8,<9, on ubuntu-latest	42s
pytest: py3.12, sphinx>=8,<9, on ubuntu-latest	37s
pytest: py3.11, sphinx>=8,<9, on ubuntu-latest	36s
Check myst-docutils install (0.20)	11s
pytest: py3.11, sphinx>=8,<9, on windows-latest	1m 13s
Check myst-docutils install (0.19)	12s
Check myst-docutils install (0.21)	12s
check	4s
Publish myst-parser to PyPi	0s
Publish myst-docutils to PyPi	0s
	4m 7s

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