Tests

Drop support for `--python-version 3.9` #21764

Job	Run time
Test mypyc suite with 32-bit Python	8m 30s
Test suite with py312-ubuntu	8m 30s
Test suite with py310-ubuntu, mypyc-compiled	8m 37s
Test suite with py313-ubuntu, mypyc-compiled	8m 29s
Test suite with py311-ubuntu	8m 30s
Test suite with py314-ubuntu, mypyc-compiled	8m 28s
Parallel tests with py314-windows-64, interpreted	8m 19s
Test suite with py314t-ubuntu, mypyc-compiled	8m 29s
Test suite with py314-windows-64	8m 24s
mypyc runtime tests with py313-macos	6m 37s
mypyc runtime tests with py310-ubuntu	6m 41s
Parallel tests with py314-ubuntu, interpreted	8m 32s
Parallel tests with py314-ubuntu, mypyc-compiled	8m 31s
Type check our own code (py310-windows-64)	2m 3s
Formatting and code style with Black + ruff	1m 55s
Type check our own code (py310-ubuntu)	1m 8s
	1h 51m 43s

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