Tests

Add support for PEP 661 (sentinels) #22583

Job	Run time
Test suite with py311-ubuntu	9m 54s
Formatting and code style with Black + ruff	1m 50s
Parallel tests with py314-ubuntu, interpreted	24m 8s
Test suite with py312-ubuntu	10m 7s
Test suite with py313-ubuntu, mypyc-compiled	15m 42s
mypyc runtime tests with py313-macos	6m 49s
Type check our own code (py310-windows-64)	1m 52s
Test mypyc suite with 32-bit Python	10m 48s
Test suite with py310-ubuntu, mypyc-compiled	16m 47s
mypyc runtime tests with py310-ubuntu	7m 36s
Test suite with py314-ubuntu, mypyc-compiled	15m 26s
Test suite with py314-windows-64	27m 20s
Test suite with py314t-ubuntu, mypyc-compiled	18m 2s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 14s
Test suite with py315-ubuntu, mypyc-compiled	15m 16s
Type check our own code (py310-ubuntu)	1m 19s
Parallel tests with py314-windows-64, interpreted	12m 21s
	3h 44m 31s

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