Tests

Add support for PEP 661 (sentinels) #22231

Job	Run time
Test mypyc suite with 32-bit Python	11m 25s
Test suite with py314-ubuntu, mypyc-compiled	16m 25s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 54s
Test suite with py313-ubuntu, mypyc-compiled	15m 18s
Test suite with py310-ubuntu, mypyc-compiled	16m 31s
Test suite with py312-ubuntu	10m 0s
Test suite with py311-ubuntu	9m 16s
mypyc runtime tests with py313-macos	6m 53s
Test suite with py314-windows-64	29m 35s
Test suite with py314t-ubuntu, mypyc-compiled	17m 45s
Test suite with py315-ubuntu, mypyc-compiled	16m 44s
mypyc runtime tests with py310-ubuntu	7m 14s
Parallel tests with py314-ubuntu, interpreted	26m 36s
Type check our own code (py310-ubuntu)	1m 4s
Parallel tests with py314-windows-64, interpreted	10m 39s
Type check our own code (py310-windows-64)	2m 13s
Formatting and code style with Black + ruff	1m 53s
	3h 48m 25s

Provide feedback