Tests

feat(mypyc): proper weakref support #20196

Job	Run time
Test mypyc suite with 32-bit Python	9m 42s
Test suite with py311-ubuntu	9m 16s
Test suite with py312-ubuntu	9m 54s
Parallel tests with py314-ubuntu, interpreted	22m 57s
Type check our own code (py310-windows-64)	2m 13s
Test suite with py314t-ubuntu, mypyc-compiled	17m 20s
mypyc runtime tests with py310-ubuntu	5m 36s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 5s
Test suite with py310-ubuntu, mypyc-compiled	15m 28s
mypyc runtime tests with py313-macos	5m 34s
Test suite with py314-ubuntu, mypyc-compiled	15m 17s
Test suite with py313-ubuntu, mypyc-compiled	14m 59s
Formatting and code style with Black + ruff	1m 50s
Type check our own code (py310-ubuntu)	1m 42s
Test suite with py314-windows-64	26m 34s
	3h 6m 27s

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