Tests

Fix crash on Unpack used without arguments in class bases (#21470) #22260

Job	Run time
Test mypyc suite with 32-bit Python	10m 41s
Test suite with py310-ubuntu, mypyc-compiled	16m 19s
Test suite with py315-ubuntu, mypyc-compiled	16m 22s
Test suite with py314-windows-64	32m 8s
mypyc runtime tests with py310-ubuntu	6m 45s
Test suite with py311-ubuntu	9m 15s
Test suite with py313-ubuntu, mypyc-compiled	15m 25s
Test suite with py314-ubuntu, mypyc-compiled	15m 28s
Parallel tests with py314-windows-64, interpreted	11m 4s
Parallel tests with py314-ubuntu, interpreted	26m 22s
Test suite with py314t-ubuntu, mypyc-compiled	18m 11s
Formatting and code style with Black + ruff	1m 41s
mypyc runtime tests with py313-macos	7m 51s
Type check our own code (py310-windows-64)	1m 52s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 23s
Test suite with py312-ubuntu	9m 39s
Type check our own code (py310-ubuntu)	1m 12s
	3h 49m 38s

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