Tests

Try using pinned version in a better way (#20989) #21265

Job	Run time
Test mypyc suite with 32-bit Python	9m 47s
Test suite with py314-ubuntu, mypyc-compiled	14m 23s
Test suite with py314-windows-64	25m 0s
Parallel tests with py314-ubuntu, interpreted	24m 56s
Test suite with py313-ubuntu, mypyc-compiled	14m 2s
Test suite with py312-ubuntu	9m 11s
Test suite with py311-ubuntu	8m 35s
Test suite with py310-ubuntu, mypyc-compiled	15m 35s
mypyc runtime tests with py313-macos	5m 20s
Type check our own code (py310-windows-64)	3m 0s
Parallel tests with py314-windows-64, interpreted	14m 9s
Formatting and code style with Black + ruff	1m 54s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 25s
Type check our own code (py310-ubuntu)	1m 34s
Test suite with py314t-ubuntu, mypyc-compiled	16m 57s
mypyc runtime tests with py310-ubuntu	5m 52s
	3h 19m 40s

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