Tests

Add changelog for mypy 2.1 (#21464) #22249

Job	Run time
Test mypyc suite with 32-bit Python	10m 45s
Test suite with py314-ubuntu, mypyc-compiled	17m 13s
Test suite with py315-ubuntu, mypyc-compiled	15m 48s
mypyc runtime tests with py313-macos	6m 27s
Type check our own code (py310-ubuntu)	1m 4s
Test suite with py310-ubuntu, mypyc-compiled	17m 9s
Test suite with py314-windows-64	28m 29s
Test suite with py311-ubuntu	9m 52s
Parallel tests with py314-ubuntu, interpreted	30m 42s
Parallel tests with py314-windows-64, interpreted	12m 4s
Test suite with py312-ubuntu	9m 58s
mypyc runtime tests with py310-ubuntu	7m 10s
Type check our own code (py310-windows-64)	1m 56s
Test suite with py313-ubuntu, mypyc-compiled	16m 46s
Formatting and code style with Black + ruff	1m 56s
Test suite with py314t-ubuntu, mypyc-compiled	19m 13s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 25s
	3h 54m 57s

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