Tests

Update changelog for some mypy 2 changes (#21279) #21826

Job	Run time
Test mypyc suite with 32-bit Python	10m 44s
Test suite with py314-ubuntu, mypyc-compiled	15m 46s
Parallel tests with py314-ubuntu, interpreted	24m 44s
Test suite with py312-ubuntu	9m 32s
Test suite with py310-ubuntu, mypyc-compiled	16m 30s
Test suite with py314-windows-64	24m 39s
mypyc runtime tests with py310-ubuntu	6m 51s
Test suite with py314t-ubuntu, mypyc-compiled	17m 48s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 33s
Test suite with py313-ubuntu, mypyc-compiled	15m 4s
Test suite with py311-ubuntu	9m 25s
mypyc runtime tests with py313-macos	6m 46s
Parallel tests with py314-windows-64, interpreted	8m 0s
Type check our own code (py310-ubuntu)	1m 7s
Formatting and code style with Black + ruff	1m 51s
Type check our own code (py310-windows-64)	2m 15s
	3h 18m 35s

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