Tests

Bump ast-serialize cache version (#21388) #22085

Job	Run time
Test mypyc suite with 32-bit Python	10m 58s
Test suite with py314t-ubuntu, mypyc-compiled	18m 35s
Test suite with py313-ubuntu, mypyc-compiled	15m 29s
Test suite with py311-ubuntu	9m 27s
Test suite with py312-ubuntu	9m 53s
Parallel tests with py314-ubuntu, interpreted	26m 57s
mypyc runtime tests with py313-macos	6m 20s
Test suite with py314-ubuntu, mypyc-compiled	15m 45s
Test suite with py314-windows-64	28m 12s
Test suite with py310-ubuntu, mypyc-compiled	16m 12s
Type check our own code (py310-windows-64)	1m 47s
Parallel tests with py314-windows-64, interpreted	11m 2s
mypyc runtime tests with py310-ubuntu	6m 42s
Parallel tests with py314-ubuntu, mypyc-compiled	26m 45s
Type check our own code (py310-ubuntu)	1m 8s
Formatting and code style with Black + ruff	1m 47s
	3h 26m 59s

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