Tests

Fix slicing with nonstrict optional (#21282) #21836

Job	Run time
Test mypyc suite with 32-bit Python	10m 40s
Test suite with py314-ubuntu, mypyc-compiled	15m 39s
Test suite with py313-ubuntu, mypyc-compiled	15m 36s
Parallel tests with py314-windows-64, interpreted	8m 18s
Test suite with py311-ubuntu	9m 13s
mypyc runtime tests with py313-macos	6m 22s
Test suite with py314-windows-64	27m 24s
Test suite with py314t-ubuntu, mypyc-compiled	17m 25s
Test suite with py312-ubuntu	9m 23s
Parallel tests with py314-ubuntu, interpreted	23m 17s
Test suite with py310-ubuntu, mypyc-compiled	16m 22s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 24s
Formatting and code style with Black + ruff	1m 45s
mypyc runtime tests with py310-ubuntu	6m 55s
Type check our own code (py310-ubuntu)	1m 14s
Type check our own code (py310-windows-64)	2m 30s
	3h 19m 27s

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