Tests

Changelog updates for 1.20 #21457

Job	Run time
Test mypyc suite with 32-bit Python	10m 31s
mypyc runtime tests with py310-ubuntu	6m 39s
Parallel tests with py314-ubuntu, interpreted	26m 22s
Test suite with py314-ubuntu, mypyc-compiled	16m 29s
Test suite with py310-ubuntu, mypyc-compiled	17m 3s
Test suite with py313-ubuntu, mypyc-compiled	16m 54s
Test suite with py312-ubuntu	11m 8s
Formatting and code style with Black + ruff	1m 55s
Test suite with py314-windows-64	30m 15s
Test suite with py311-ubuntu	10m 1s
mypyc runtime tests with py313-macos	4m 30s
Test suite with py314t-ubuntu, mypyc-compiled	18m 57s
Type check our own code (py310-ubuntu)	1m 46s
Parallel tests with py314-ubuntu, mypyc-compiled	26m 20s
Parallel tests with py314-windows-64, interpreted	14m 14s
Type check our own code (py310-windows-64)	2m 33s
	3h 35m 37s

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