Tests

librt: Fix aliasing related segfault with vec append (#21303) #21892

Job	Run time
Test mypyc suite with 32-bit Python	10m 50s
Parallel tests with py314-windows-64, interpreted	11m 26s
Test suite with py314-windows-64	31m 40s
Test suite with py310-ubuntu, mypyc-compiled	16m 28s
Test suite with py314-ubuntu, mypyc-compiled	15m 44s
Test suite with py311-ubuntu	9m 33s
Test suite with py313-ubuntu, mypyc-compiled	15m 37s
Test suite with py314t-ubuntu, mypyc-compiled	18m 10s
Type check our own code (py310-ubuntu)	1m 9s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 42s
mypyc runtime tests with py310-ubuntu	7m 5s
Type check our own code (py310-windows-64)	1m 53s
Test suite with py312-ubuntu	10m 18s
Parallel tests with py314-ubuntu, interpreted	23m 42s
Formatting and code style with Black + ruff	1m 58s
mypyc runtime tests with py313-macos	6m 14s
	3h 31m 29s

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