Tests

Add support for PEP 661 (sentinels) #22611

Job	Run time
Test mypyc suite with 32-bit Python	12m 12s
Test suite with py315-ubuntu, mypyc-compiled	15m 39s
mypyc runtime tests with py310-ubuntu	7m 39s
Test suite with py310-ubuntu, mypyc-compiled	16m 34s
Test suite with py314-windows-64	33m 20s
Formatting and code style with Black + ruff	1m 57s
Type check our own code (py310-ubuntu)	1m 7s
Test suite with py313-ubuntu, mypyc-compiled	15m 27s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 36s
mypyc runtime tests with py313-macos	6m 52s
Parallel tests with py314-windows-64, interpreted	10m 17s
Test suite with py312-ubuntu	10m 12s
Test suite with py311-ubuntu	10m 0s
Test suite with py314-ubuntu, mypyc-compiled	16m 5s
Test suite with py314t-ubuntu, mypyc-compiled	17m 56s
Parallel tests with py314-ubuntu, interpreted	27m 49s
Type check our own code (py310-windows-64)	1m 57s
	3h 53m 39s

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