Tests

Add support for PEP 661 (sentinels) #22251

Job	Run time
Test mypyc suite with 32-bit Python	1m 43s
Test suite with py314-windows-64	1m 53s
Test suite with py312-ubuntu	1m 56s
Test suite with py314t-ubuntu, mypyc-compiled	1m 56s
Test suite with py313-ubuntu, mypyc-compiled	1m 54s
Test suite with py310-ubuntu, mypyc-compiled	1m 56s
mypyc runtime tests with py310-ubuntu	1m 56s
Test suite with py315-ubuntu, mypyc-compiled	1m 57s
Test suite with py311-ubuntu	1m 55s
Type check our own code (py310-windows-64)	1m 48s
Parallel tests with py314-ubuntu, mypyc-compiled	1m 55s
Parallel tests with py314-windows-64, interpreted	1m 56s
Test suite with py314-ubuntu, mypyc-compiled	1m 58s
Type check our own code (py310-ubuntu)	1m 10s
mypyc runtime tests with py313-macos	2m 0s
Formatting and code style with Black + ruff	1m 54s
Parallel tests with py314-ubuntu, interpreted	1m 56s
	31m 43s

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