Tests

pin librt requirement to 0.4.0 #19323

Job	Run time
Test mypyc suite with 32-bit Python	8m 35s
Test suite with py310-ubuntu	12m 12s
mypyc runtime tests with py313-macos	5m 51s
Test suite with py313-ubuntu, mypyc-compiled	32s
Test suite with py312-ubuntu, mypyc-compiled	26s
Test suite with py314-ubuntu, mypyc-compiled	30s
mypyc runtime tests with py310-ubuntu	4m 25s
Test suite with py39-ubuntu, mypyc-compiled	25s
Test suite with py311-ubuntu	9m 53s
Test suite with py314-windows-64	26m 30s
Type check our own code (py39-windows-64)	2m 24s
Formatting and code style with Black + ruff	1m 55s
Type check our own code (py39-ubuntu)	1m 39s
	1h 15m 17s

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