Tests

[mypyc] Add new type for expressing header dependencies (#21223) #21714

Job	Run time
Test mypyc suite with 32-bit Python	11m 10s
Test suite with py312-ubuntu	9m 29s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 57s
mypyc runtime tests with py310-ubuntu	6m 14s
Parallel tests with py314-ubuntu, interpreted	25m 21s
Test suite with py314t-ubuntu, mypyc-compiled	17m 52s
Formatting and code style with Black + ruff	1m 51s
Parallel tests with py314-windows-64, interpreted	9m 19s
Test suite with py311-ubuntu	9m 25s
Type check our own code (py310-ubuntu)	1m 35s
Test suite with py313-ubuntu, mypyc-compiled	15m 55s
mypyc runtime tests with py313-macos	6m 9s
Test suite with py310-ubuntu, mypyc-compiled	15m 59s
Test suite with py314-ubuntu, mypyc-compiled	15m 35s
Test suite with py314-windows-64	25m 20s
Type check our own code (py310-windows-64)	2m 20s
	3h 21m 31s

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