Tests

Add support for PEP 661 (sentinels) #22584

Job	Run time
Test mypyc suite with 32-bit Python	11m 49s
Test suite with py312-ubuntu	10m 24s
Test suite with py314-ubuntu, mypyc-compiled	15m 8s
Test suite with py314t-ubuntu, mypyc-compiled	17m 55s
Test suite with py310-ubuntu, mypyc-compiled	16m 21s
mypyc runtime tests with py313-macos	8m 55s
Test suite with py315-ubuntu, mypyc-compiled	15m 27s
Test suite with py313-ubuntu, mypyc-compiled	15m 46s
Test suite with py311-ubuntu	10m 38s
Parallel tests with py314-ubuntu, interpreted	25m 30s
Test suite with py314-windows-64	32m 28s
Formatting and code style with Black + ruff	2m 1s
Type check our own code (py310-windows-64)	1m 40s
Type check our own code (py310-ubuntu)	1m 9s
Parallel tests with py314-windows-64, interpreted	11m 39s
mypyc runtime tests with py310-ubuntu	8m 3s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 7s
	3h 54m 0s

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