Tests

Tests #441

Job	Run time
Test mypyc suite with 32-bit Python	10m 26s
Test suite with py311-ubuntu	8m 35s
Test suite with py39-ubuntu, mypyc-compiled	15m 1s
Test suite with py310-ubuntu	11m 35s
Type check our own code (py39-ubuntu)	1m 37s
mypyc runtime tests with py313-macos	5m 40s
Test suite with py314-ubuntu, mypyc-compiled	14m 11s
Test suite with py314-windows-64	25m 49s
Test suite with py312-ubuntu, mypyc-compiled	14m 8s
Test suite with py313-ubuntu, mypyc-compiled	13m 48s
mypyc runtime tests with py313-ubuntu	4m 51s
Type check our own code (py39-windows-64)	2m 21s
Formatting and code style with Black + ruff	2m 10s
	2h 10m 12s

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