Tests

Report incompatible ast-serialize versions clearly #22359

Job	Run time
Test mypyc suite with 32-bit Python	11m 43s
Type check our own code (py310-windows-64)	2m 33s
Formatting and code style with Black + ruff	1m 59s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 37s
Test suite with py311-ubuntu	9m 44s
Type check our own code (py310-ubuntu)	1m 16s
Test suite with py314t-ubuntu, mypyc-compiled	19m 23s
Test suite with py310-ubuntu, mypyc-compiled	17m 16s
mypyc runtime tests with py313-macos	6m 28s
Test suite with py315-ubuntu, mypyc-compiled	15m 10s
Test suite with py314-ubuntu, mypyc-compiled	16m 45s
Parallel tests with py314-ubuntu, interpreted	27m 30s
Test suite with py312-ubuntu	10m 9s
Parallel tests with py314-windows-64, interpreted	10m 50s
Test suite with py314-windows-64	32m 50s
mypyc runtime tests with py310-ubuntu	6m 51s
Test suite with py313-ubuntu, mypyc-compiled	16m 52s
	3h 56m 56s

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