Tests

feat: new mypyc primitive for weakref.ref #16892

Job	Run time
Test mypyc suite with 32-bit Python	9m 17s
Test suite with py310-ubuntu	12m 14s
Test suite with py39-windows-64	24m 19s
Test suite with py311-ubuntu	9m 9s
Type check our own code (py39-windows-64)	2m 19s
Test suite with py313-ubuntu, mypyc-compiled	13m 45s
Test suite with py314-dev-ubuntu	16m 52s
Test suite with py39-ubuntu, mypyc-compiled	13m 43s
Test suite with py312-ubuntu, mypyc-compiled	13m 22s
mypyc runtime tests with py39-macos	5m 19s
Formatting and code style with Black + ruff	1m 41s
Type check our own code (py39-ubuntu)	1m 42s
	2h 3m 42s

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