Tests

Fix changelog for mypy 2.1 (#21565) #22449

Job	Run time
Test mypyc suite with 32-bit Python	11m 39s
Test suite with py310-ubuntu, mypyc-compiled	16m 56s
Test suite with py313-ubuntu, mypyc-compiled	16m 39s
Test suite with py314-ubuntu, mypyc-compiled	16m 47s
Test suite with py311-ubuntu	9m 57s
Test suite with py314-windows-64	25m 22s
Formatting and code style with Black + ruff	1m 52s
Test suite with py315-ubuntu, mypyc-compiled	16m 50s
Test suite with py312-ubuntu	10m 12s
Test suite with py314t-ubuntu, mypyc-compiled	18m 5s
Parallel tests with py314-ubuntu, mypyc-compiled	31m 11s
Type check our own code (py310-ubuntu)	1m 6s
Type check our own code (py310-windows-64)	1m 54s
mypyc runtime tests with py313-macos	5m 20s
mypyc runtime tests with py310-ubuntu	7m 8s
Parallel tests with py314-ubuntu, interpreted	24m 59s
Parallel tests with py314-windows-64, interpreted	10m 55s
	3h 46m 52s

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