Use newer Python in docs build (#17747) #447

Job	Run time
Test mypyc suite with 32-bit Python	6m 42s
Test suite with py38-ubuntu, mypyc-compiled	17m 48s
Test suite with py38-windows-64	20m 10s
Test suite with Python nightly	14m 2s
Test suite with py39-ubuntu	19m 33s
Test suite with py310-ubuntu	15m 26s
Test suite with py311-ubuntu, mypyc-compiled	15m 37s
Test suite with py312-ubuntu, mypyc-compiled	17m 47s
mypyc runtime tests with py39-macos	5m 1s
mypyc runtime tests with py38-debug-build-ubuntu	4m 42s
Type check our own code (py38-ubuntu)	1m 50s
Type check our own code (py38-windows-64)	2m 28s
Formatting and code style with Black + ruff	40s
	2h 21m 46s

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