Tests

Rework starargs with union argument #17419

Job	Run time
Test mypyc suite with 32-bit Python	9m 12s
Test suite with py310-ubuntu	11m 17s
Test suite with py313-ubuntu, mypyc-compiled	12m 55s
mypyc runtime tests with py39-macos	6m 17s
Test suite with py39-ubuntu, mypyc-compiled	13m 45s
Type check our own code (py39-windows-64)	2m 4s
Type check our own code (py39-ubuntu)	1m 34s
Test suite with py314-dev-ubuntu	15m 38s
Test suite with py313-windows-64	22m 9s
Test suite with py312-ubuntu, mypyc-compiled	12m 32s
Test suite with py311-ubuntu	8m 23s
Formatting and code style with Black + ruff	1m 51s
	1h 57m 37s

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