Tests

Add support for PEP 661 (sentinels) #22252

Job	Run time
Test mypyc suite with 32-bit Python	10m 37s
Test suite with py313-ubuntu, mypyc-compiled	16m 15s
Test suite with py314t-ubuntu, mypyc-compiled	18m 6s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 28s
Parallel tests with py314-windows-64, interpreted	10m 20s
Formatting and code style with Black + ruff	1m 54s
Type check our own code (py310-windows-64)	1m 54s
Test suite with py314-ubuntu, mypyc-compiled	15m 49s
Parallel tests with py314-ubuntu, interpreted	26m 29s
Test suite with py315-ubuntu, mypyc-compiled	16m 24s
mypyc runtime tests with py310-ubuntu	6m 46s
Type check our own code (py310-ubuntu)	1m 12s
Test suite with py312-ubuntu	10m 6s
Test suite with py310-ubuntu, mypyc-compiled	16m 29s
mypyc runtime tests with py313-macos	6m 40s
Test suite with py311-ubuntu	9m 42s
Test suite with py314-windows-64	28m 30s
	3h 45m 41s

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