Tests

Modernise test cases to use PEP 526 #20208

Job	Run time
Test mypyc suite with 32-bit Python	9m 44s
Test suite with py314t-ubuntu, mypyc-compiled	16m 35s
Test suite with py311-ubuntu	9m 33s
Test suite with py312-ubuntu	9m 59s
Parallel tests with py314-ubuntu, mypyc-compiled	26m 49s
Test suite with py310-ubuntu, mypyc-compiled	15m 8s
mypyc runtime tests with py313-macos	6m 16s
Test suite with py313-ubuntu, mypyc-compiled	14m 55s
Parallel tests with py314-ubuntu, interpreted	23m 26s
Test suite with py314-windows-64	27m 49s
Test suite with py314-ubuntu, mypyc-compiled	14m 35s
mypyc runtime tests with py310-ubuntu	5m 30s
Type check our own code (py310-windows-64)	3m 11s
Type check our own code (py310-ubuntu)	1m 28s
Formatting and code style with Black + ruff	1m 56s
	3h 6m 54s

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