Tests

Bump version to 1.20.1 #21649

Job	Run time
Test mypyc suite with 32-bit Python	9m 47s
Test suite with py314-ubuntu, mypyc-compiled	15m 26s
Parallel tests with py314-ubuntu, interpreted	21m 25s
Test suite with py314t-ubuntu, mypyc-compiled	18m 30s
Test suite with py314-windows-64	27m 50s
Formatting and code style with Black + ruff	1m 47s
mypyc runtime tests with py310-ubuntu	6m 31s
Parallel tests with py314-windows-64, interpreted	8m 2s
Type check our own code (py310-ubuntu)	1m 50s
Test suite with py311-ubuntu	8m 49s
Test suite with py310-ubuntu, mypyc-compiled	16m 9s
Test suite with py313-ubuntu, mypyc-compiled	14m 56s
Type check our own code (py310-windows-64)	2m 19s
Test suite with py312-ubuntu	9m 20s
Parallel tests with py314-ubuntu, mypyc-compiled	25m 40s
mypyc runtime tests with py313-macos	4m 32s
	3h 12m 53s

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