Tests

[mypyc] fix: Final load in unreachable branches #20257

Job	Run time
Test mypyc suite with 32-bit Python	9m 40s
Test suite with py312-ubuntu	10m 20s
Test suite with py314-ubuntu, mypyc-compiled	14m 50s
Test suite with py310-ubuntu, mypyc-compiled	15m 47s
Type check our own code (py310-ubuntu)	1m 40s
Parallel tests with py314-ubuntu, interpreted	25m 7s
Type check our own code (py310-windows-64)	2m 24s
Test suite with py314t-ubuntu, mypyc-compiled	16m 53s
mypyc runtime tests with py313-macos	5m 23s
Formatting and code style with Black + ruff	1m 54s
Test suite with py314-windows-64	27m 25s
Test suite with py311-ubuntu	9m 18s
mypyc runtime tests with py310-ubuntu	5m 39s
Test suite with py313-ubuntu, mypyc-compiled	14m 5s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 6s
	3h 9m 31s

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