Tests

Changelog updates for 1.20 #21460

Job	Run time
Test mypyc suite with 32-bit Python	10m 33s
Test suite with py314-windows-64	29m 38s
mypyc runtime tests with py310-ubuntu	6m 18s
Test suite with py313-ubuntu, mypyc-compiled	17m 4s
Test suite with py314-ubuntu, mypyc-compiled	16m 19s
Parallel tests with py314-ubuntu, interpreted	23m 45s
Parallel tests with py314-windows-64, interpreted	10m 13s
Parallel tests with py314-ubuntu, mypyc-compiled	26m 30s
Test suite with py310-ubuntu, mypyc-compiled	16m 47s
Test suite with py311-ubuntu	9m 43s
Type check our own code (py310-windows-64)	2m 41s
Type check our own code (py310-ubuntu)	1m 44s
mypyc runtime tests with py313-macos	6m 8s
Test suite with py314t-ubuntu, mypyc-compiled	19m 11s
Formatting and code style with Black + ruff	2m 1s
Test suite with py312-ubuntu	10m 46s
	3h 29m 21s

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