Tests

Modernise test cases to use PEP 526 #20207

Job	Run time
Test mypyc suite with 32-bit Python	9m 25s
Test suite with py310-ubuntu, mypyc-compiled	15m 55s
Test suite with py311-ubuntu	10m 8s
Test suite with py314-windows-64	25m 5s
Test suite with py313-ubuntu, mypyc-compiled	14m 12s
Test suite with py314-ubuntu, mypyc-compiled	14m 59s
Test suite with py312-ubuntu	10m 3s
Type check our own code (py310-windows-64)	2m 22s
Formatting and code style with Black + ruff	1m 52s
mypyc runtime tests with py313-macos	5m 35s
mypyc runtime tests with py310-ubuntu	5m 36s
Test suite with py314t-ubuntu, mypyc-compiled	17m 46s
Type check our own code (py310-ubuntu)	1m 44s
Parallel tests with py314-ubuntu, mypyc-compiled	30m 40s
Parallel tests with py314-ubuntu, interpreted	23m 28s
	3h 8m 50s

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