Tests

Fix issue #20820 #20878

Job	Run time
Test mypyc suite with 32-bit Python	8m 31s
Test suite with py310-ubuntu, mypyc-compiled	5m 55s
mypyc runtime tests with py313-macos	2m 39s
Test suite with py311-ubuntu	7m 46s
Type check our own code (py310-ubuntu)	1m 40s
mypyc runtime tests with py310-ubuntu	4m 42s
Test suite with py314-ubuntu, mypyc-compiled	4m 34s
Test suite with py314-windows-64	24m 35s
Test suite with py312-ubuntu	9m 9s
Parallel tests with py314-ubuntu, interpreted	24m 38s
Type check our own code (py310-windows-64)	2m 32s
Test suite with py314t-ubuntu, mypyc-compiled	5m 33s
Test suite with py313-ubuntu, mypyc-compiled	4m 38s
Parallel tests with py314-windows-64, interpreted	11m 19s
Parallel tests with py314-ubuntu, mypyc-compiled	4m 57s
Formatting and code style with Black + ruff	1m 50s
	2h 4m 58s

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