Tests

Fix slicing with nonstrict optional #21834

Job	Run time
Test mypyc suite with 32-bit Python	10m 36s
Test suite with py314t-ubuntu, mypyc-compiled	17m 2s
mypyc runtime tests with py313-macos	4m 48s
Test suite with py314-ubuntu, mypyc-compiled	16m 18s
Parallel tests with py314-windows-64, interpreted	8m 20s
Parallel tests with py314-ubuntu, interpreted	25m 13s
Test suite with py311-ubuntu	9m 29s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 30s
Test suite with py310-ubuntu, mypyc-compiled	16m 21s
Test suite with py312-ubuntu	9m 33s
Test suite with py314-windows-64	27m 12s
Type check our own code (py310-ubuntu)	1m 4s
Formatting and code style with Black + ruff	1m 54s
mypyc runtime tests with py310-ubuntu	6m 7s
Test suite with py313-ubuntu, mypyc-compiled	15m 24s
Type check our own code (py310-windows-64)	2m 19s
	3h 21m 10s

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