Sync typeshed #13909

Job	Run time
Test mypyc suite with 32-bit Python	7m 8s
Test suite with py38-ubuntu, mypyc-compiled	18m 16s
Test suite with py38-windows-64	20m 18s
Test suite with py39-ubuntu	17m 21s
Test suite with py310-ubuntu	16m 30s
Test suite with py311-ubuntu, mypyc-compiled	15m 56s
Test suite with py312-ubuntu, mypyc-compiled	18m 34s
Test suite with py313-ubuntu, mypyc-compiled	18m 38s
mypyc runtime tests with py39-macos	4m 37s
Type check our own code (py38-ubuntu)	1m 57s
Type check our own code (py38-windows-64)	2m 11s
Formatting and code style with Black + ruff	54s
	2h 22m 20s

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