Tests

[mypyc] Fix coercion from short tagged int to fixed-width int #20145

Job	Run time
Test mypyc suite with 32-bit Python	9m 48s
Formatting and code style with Black + ruff	1m 54s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 20s
Test suite with py314-windows-64	27m 0s
Type check our own code (py310-windows-64)	2m 19s
Test suite with py314t-ubuntu, mypyc-compiled	18m 5s
Test suite with py312-ubuntu	10m 10s
Test suite with py314-ubuntu, mypyc-compiled	15m 1s
Test suite with py310-ubuntu, mypyc-compiled	15m 43s
Test suite with py313-ubuntu, mypyc-compiled	15m 1s
Type check our own code (py310-ubuntu)	1m 47s
Parallel tests with py314-ubuntu, interpreted	25m 34s
mypyc runtime tests with py310-ubuntu	5m 26s
Test suite with py311-ubuntu	9m 14s
mypyc runtime tests with py313-macos	6m 22s
	3h 12m 44s

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