Tests

Bump ast-serialize to 0.6.0 #22615

Job	Run time
Test mypyc suite with 32-bit Python	11m 58s
Test suite with py310-ubuntu, mypyc-compiled	16m 48s
Test suite with py314t-ubuntu, mypyc-compiled	18m 6s
Test suite with py315-ubuntu, mypyc-compiled	15m 47s
Parallel tests with py314-ubuntu, mypyc-compiled	31m 54s
Test suite with py314-ubuntu, mypyc-compiled	15m 29s
mypyc runtime tests with py313-macos	9m 0s
Test suite with py312-ubuntu	10m 15s
Formatting and code style with Black + ruff	1m 48s
Test suite with py314-windows-64	32m 5s
Parallel tests with py314-windows-64, interpreted	14m 37s
Test suite with py311-ubuntu	10m 2s
Test suite with py313-ubuntu, mypyc-compiled	15m 38s
Type check our own code (py310-ubuntu)	1m 13s
mypyc runtime tests with py310-ubuntu	7m 37s
Parallel tests with py314-ubuntu, interpreted	25m 59s
Type check our own code (py310-windows-64)	2m 27s
	4h 0m 43s

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