Tests

Bump ast-serialize to 0.6.0 (#21664) #22618

Job	Run time
Test mypyc suite with 32-bit Python	11m 58s
Parallel tests with py314-ubuntu, interpreted	26m 30s
Test suite with py312-ubuntu	10m 16s
Test suite with py314t-ubuntu, mypyc-compiled	17m 18s
mypyc runtime tests with py313-macos	8m 39s
Type check our own code (py310-ubuntu)	1m 2s
Test suite with py313-ubuntu, mypyc-compiled	16m 3s
Test suite with py315-ubuntu, mypyc-compiled	15m 14s
Test suite with py310-ubuntu, mypyc-compiled	17m 12s
Parallel tests with py314-windows-64, interpreted	10m 58s
Type check our own code (py310-windows-64)	1m 57s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 30s
Test suite with py311-ubuntu	9m 41s
Test suite with py314-windows-64	31m 29s
Test suite with py314-ubuntu, mypyc-compiled	16m 8s
mypyc runtime tests with py310-ubuntu	7m 18s
Formatting and code style with Black + ruff	1m 56s
	3h 51m 9s

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