Tests

Report incompatible ast-serialize versions clearly #22358

Job	Run time
Test suite with py312-ubuntu	10m 12s
Test suite with py315-ubuntu, mypyc-compiled	15m 40s
Parallel tests with py314-ubuntu, interpreted	26m 1s
Test suite with py314-ubuntu, mypyc-compiled	15m 58s
Test suite with py310-ubuntu, mypyc-compiled	16m 12s
Type check our own code (py310-windows-64)	1m 59s
Test suite with py314-windows-64	32m 16s
Type check our own code (py310-ubuntu)	1m 14s
Test suite with py314t-ubuntu, mypyc-compiled	17m 47s
mypyc runtime tests with py310-ubuntu	7m 18s
Test suite with py311-ubuntu	9m 49s
Parallel tests with py314-windows-64, interpreted	12m 21s
Test suite with py313-ubuntu, mypyc-compiled	16m 22s
mypyc runtime tests with py313-macos	5m 21s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 5s
Formatting and code style with Black + ruff	1m 53s
Test mypyc suite with 32-bit Python	17m 36s
	3h 56m 4s

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