Tests

Cleanup some more tests after dropping 3.9 support #21786

Job	Run time
Test mypyc suite with 32-bit Python	10m 35s
Parallel tests with py314-windows-64, interpreted	8m 15s
Test suite with py311-ubuntu	9m 24s
Type check our own code (py310-windows-64)	1m 54s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 55s
Test suite with py310-ubuntu, mypyc-compiled	16m 10s
Test suite with py313-ubuntu, mypyc-compiled	15m 27s
mypyc runtime tests with py310-ubuntu	6m 40s
Parallel tests with py314-ubuntu, interpreted	24m 32s
Formatting and code style with Black + ruff	2m 2s
Test suite with py314t-ubuntu, mypyc-compiled	16m 56s
Test suite with py312-ubuntu	9m 51s
Test suite with py314-windows-64	21m 52s
Type check our own code (py310-ubuntu)	1m 14s
Test suite with py314-ubuntu, mypyc-compiled	15m 16s
mypyc runtime tests with py313-macos	7m 30s
	3h 15m 33s

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