Tests

Start testing Python 3.14 #15899

Job	Run time
Test mypyc suite with 32-bit Python	7m 33s
Test suite with py39-ubuntu, mypyc-compiled	14m 49s
Test suite with py39-windows-64	23m 15s
Test suite with py310-ubuntu	10m 31s
Test suite with py311-ubuntu	9m 6s
Test suite with py312-ubuntu, mypyc-compiled	14m 29s
Test suite with py313-ubuntu, mypyc-compiled	14m 45s
Test suite with py314-dev-ubuntu	18m 22s
mypyc runtime tests with py39-macos	5m 32s
Type check our own code (py39-ubuntu)	2m 2s
Type check our own code (py39-windows-64)	3m 3s
Formatting and code style with Black + ruff	1m 52s
	2h 5m 19s

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