Tests

librt: Fix aliasing related segfault with vec append #21891

Job	Run time
Parallel tests with py314-windows-64, interpreted	12m 10s
Test suite with py313-ubuntu, mypyc-compiled	15m 23s
Test suite with py312-ubuntu	9m 40s
Test suite with py310-ubuntu, mypyc-compiled	16m 52s
Type check our own code (py310-windows-64)	1m 43s
mypyc runtime tests with py310-ubuntu	6m 36s
Parallel tests with py314-ubuntu, interpreted	25m 46s
Test suite with py314-windows-64	31m 21s
mypyc runtime tests with py313-macos	7m 51s
Test suite with py314-ubuntu, mypyc-compiled	16m 8s
Formatting and code style with Black + ruff	2m 2s
Test suite with py314t-ubuntu, mypyc-compiled	18m 3s
Type check our own code (py310-ubuntu)	1m 9s
Test mypyc suite with 32-bit Python	10m 54s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 2s
Test suite with py311-ubuntu	9m 6s
	3h 33m 46s

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