Tests

Use new Github actions ARM runners for tests #14531

Job	Run time
Test mypyc suite with 32-bit Python	7m 30s
Test suite with py39-ubuntu, mypyc-compiled	7m 8s
Test suite with py39-windows-64	16m 54s
Test suite with py310-ubuntu	14s
Test suite with py311-ubuntu, mypyc-compiled	5m 21s
Test suite with py312-ubuntu, mypyc-compiled	5m 46s
Test suite with py313-ubuntu, mypyc-compiled	5m 45s
mypyc runtime tests with py39-macos	3m 53s
Type check our own code (py39-ubuntu)	2m 1s
Type check our own code (py39-windows-64)	2m 35s
Formatting and code style with Black + ruff	1m 52s
	58m 59s

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