Tests

Drop support for running with Python 3.9 #19519

Job	Run time
Test mypyc suite with 32-bit Python	9m 14s
Test suite with py311-ubuntu	9m 8s
Test suite with py312-ubuntu	10m 13s
Test suite with py310-ubuntu, mypyc-compiled	14m 28s
Test suite with py313-ubuntu, mypyc-compiled	15m 19s
Test suite with py314-ubuntu, mypyc-compiled	14m 27s
Test suite with py314-windows-64	26m 31s
mypyc runtime tests with py310-ubuntu	5m 14s
mypyc runtime tests with py313-macos	4m 19s
Type check our own code (py310-ubuntu)	1m 25s
Formatting and code style with Black + ruff	1m 54s
Type check our own code (py310-windows-64)	2m 50s
	1h 55m 2s

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