Tests

feat(mypyc): proper weakref support #20193

Job	Run time
Test mypyc suite with 32-bit Python	9m 47s
Test suite with py314t-ubuntu, mypyc-compiled	16m 58s
Test suite with py311-ubuntu	9m 8s
Test suite with py312-ubuntu	9m 59s
Test suite with py314-ubuntu, mypyc-compiled	15m 38s
Test suite with py310-ubuntu, mypyc-compiled	14m 57s
Test suite with py314-windows-64	27m 4s
Type check our own code (py310-windows-64)	2m 44s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 52s
Formatting and code style with Black + ruff	1m 54s
Test suite with py313-ubuntu, mypyc-compiled	15m 6s
mypyc runtime tests with py310-ubuntu	5m 16s
Type check our own code (py310-ubuntu)	1m 39s
mypyc runtime tests with py313-macos	5m 58s
Parallel tests with py314-ubuntu, interpreted	22m 21s
	3h 8m 21s

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