Tests

Bump librt to 0.13.0 (#21698) #22677

Job	Run time
Test mypyc suite with 32-bit Python	11m 26s
mypyc runtime tests with py313-macos	7m 37s
Test suite with py314-windows-64	29m 31s
Type check our own code (py310-windows-64)	1m 55s
Parallel tests with py314-windows-64, interpreted	13m 35s
Test suite with py314t-ubuntu, mypyc-compiled	18m 46s
Parallel tests with py314-ubuntu, mypyc-compiled	30m 53s
Test suite with py315-ubuntu, mypyc-compiled	16m 26s
Test suite with py310-ubuntu, mypyc-compiled	17m 24s
Parallel tests with py314-ubuntu, interpreted	27m 30s
Test suite with py312-ubuntu	9m 49s
mypyc runtime tests with py310-ubuntu	8m 3s
Type check our own code (py310-ubuntu)	1m 16s
Test suite with py314-ubuntu, mypyc-compiled	16m 23s
Formatting and code style with Black + ruff	1m 54s
Test suite with py311-ubuntu	10m 0s
Test suite with py313-ubuntu, mypyc-compiled	16m 18s
	3h 58m 46s

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