Tests

Bump librt to 0.12.0 (#21663) #22614

Job	Run time
Test suite with py315-ubuntu, mypyc-compiled	16m 8s
Type check our own code (py310-windows-64)	1m 48s
Test suite with py314-windows-64	33m 56s
Parallel tests with py314-windows-64, interpreted	10m 50s
Test suite with py310-ubuntu, mypyc-compiled	16m 55s
Parallel tests with py314-ubuntu, interpreted	26m 30s
Test mypyc suite with 32-bit Python	8m 44s
Test suite with py313-ubuntu, mypyc-compiled	15m 48s
Formatting and code style with Black + ruff	1m 57s
mypyc runtime tests with py310-ubuntu	7m 47s
Test suite with py312-ubuntu	9m 58s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 50s
Test suite with py314-ubuntu, mypyc-compiled	16m 7s
Test suite with py311-ubuntu	9m 33s
Type check our own code (py310-ubuntu)	1m 9s
Test suite with py314t-ubuntu, mypyc-compiled	17m 54s
mypyc runtime tests with py313-macos	7m 11s
	3h 52m 5s

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