Tests

Respect explicit return type of new() #22387

Job	Run time
Test mypyc suite with 32-bit Python	12m 11s
Test suite with py312-ubuntu	10m 17s
Formatting and code style with Black + ruff	2m 9s
Test suite with py314t-ubuntu, mypyc-compiled	18m 58s
Test suite with py311-ubuntu	9m 12s
Type check our own code (py310-windows-64)	2m 0s
mypyc runtime tests with py313-macos	7m 32s
Parallel tests with py314-ubuntu, interpreted	26m 49s
Test suite with py314-ubuntu, mypyc-compiled	16m 28s
mypyc runtime tests with py310-ubuntu	6m 48s
Test suite with py314-windows-64	29m 8s
Test suite with py315-ubuntu, mypyc-compiled	16m 22s
Parallel tests with py314-windows-64, interpreted	10m 36s
Test suite with py310-ubuntu, mypyc-compiled	16m 19s
Type check our own code (py310-ubuntu)	1m 17s
Parallel tests with py314-ubuntu, mypyc-compiled	31m 6s
Test suite with py313-ubuntu, mypyc-compiled	15m 57s
	3h 53m 9s

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