Tests

Sync typeshed #13627

Job	Run time
Test mypyc suite with 32-bit Python	7m 20s
Test suite with py38-ubuntu, mypyc-compiled	18m 0s
Test suite with py38-windows-64	20m 19s
Test suite with py39-ubuntu	16m 26s
Test suite with py310-ubuntu	15m 48s
Test suite with py311-ubuntu, mypyc-compiled	15m 33s
Test suite with py312-ubuntu, mypyc-compiled	17m 48s
Test suite with py313-ubuntu, mypyc-compiled	17m 52s
mypyc runtime tests with py39-macos	4m 29s
Type check our own code (py38-ubuntu)	1m 54s
Type check our own code (py38-windows-64)	2m 33s
Formatting and code style with Black + ruff	35s
	2h 18m 37s

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