Tests

feat(mypyc): proper weakref support #20177

Job	Run time
Test mypyc suite with 32-bit Python	9m 42s
Test suite with py314t-ubuntu, mypyc-compiled	8m 23s
Test suite with py313-ubuntu, mypyc-compiled	6m 29s
Test suite with py311-ubuntu	9m 17s
Test suite with py314-ubuntu, mypyc-compiled	6m 42s
Parallel tests with py314-ubuntu, interpreted	22m 45s
Parallel tests with py314-ubuntu, mypyc-compiled	6m 33s
mypyc runtime tests with py313-macos	7m 37s
Type check our own code (py310-ubuntu)	1m 32s
Test suite with py312-ubuntu	9m 33s
Test suite with py310-ubuntu, mypyc-compiled	5m 24s
Test suite with py314-windows-64	27m 16s
Type check our own code (py310-windows-64)	2m 24s
Formatting and code style with Black + ruff	1m 56s
mypyc runtime tests with py310-ubuntu	5m 28s
	2h 11m 1s

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