Tests

[mypyc] Fix reference leak when setting unboxed refcounted attrs (#21… #22610

Job	Run time
Test suite with py313-ubuntu, mypyc-compiled	15m 39s
Test suite with py314-windows-64	33m 27s
mypyc runtime tests with py313-macos	9m 26s
Test suite with py314t-ubuntu, mypyc-compiled	18m 5s
Test suite with py310-ubuntu, mypyc-compiled	16m 29s
Test suite with py311-ubuntu	9m 45s
Test suite with py315-ubuntu, mypyc-compiled	16m 3s
Test suite with py314-ubuntu, mypyc-compiled	15m 52s
Formatting and code style with Black + ruff	1m 47s
Test mypyc suite with 32-bit Python	7m 16s
Type check our own code (py310-windows-64)	2m 20s
Test suite with py312-ubuntu	10m 29s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 25s
mypyc runtime tests with py310-ubuntu	5m 53s
Parallel tests with py314-windows-64, interpreted	11m 5s
Parallel tests with py314-ubuntu, interpreted	29m 58s
Type check our own code (py310-ubuntu)	1m 5s
	3h 53m 4s

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