Tests

Drop support for `--python-version 3.9` #21769

Job	Run time
Test mypyc suite with 32-bit Python	10m 43s
Test suite with py313-ubuntu, mypyc-compiled	16m 3s
Test suite with py312-ubuntu	9m 25s
Test suite with py311-ubuntu	8m 52s
Test suite with py314-ubuntu, mypyc-compiled	15m 10s
Test suite with py314t-ubuntu, mypyc-compiled	17m 34s
Parallel tests with py314-windows-64, interpreted	8m 43s
mypyc runtime tests with py310-ubuntu	5m 33s
Formatting and code style with Black + ruff	1m 45s
Parallel tests with py314-ubuntu, interpreted	23m 52s
Test suite with py310-ubuntu, mypyc-compiled	16m 33s
mypyc runtime tests with py313-macos	6m 41s
Test suite with py314-windows-64	27m 41s
Type check our own code (py310-windows-64)	2m 23s
Type check our own code (py310-ubuntu)	1m 12s
Parallel tests with py314-ubuntu, mypyc-compiled	26m 44s
	3h 18m 54s

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