Tests

Mark more things as literals #20197

Job	Run time
Test mypyc suite with 32-bit Python	9m 36s
Test suite with py310-ubuntu, mypyc-compiled	15m 6s
Test suite with py314t-ubuntu, mypyc-compiled	17m 18s
Test suite with py313-ubuntu, mypyc-compiled	15m 9s
Test suite with py314-ubuntu, mypyc-compiled	15m 7s
mypyc runtime tests with py313-macos	4m 40s
Test suite with py312-ubuntu	9m 50s
mypyc runtime tests with py310-ubuntu	5m 45s
Test suite with py311-ubuntu	9m 30s
Test suite with py314-windows-64	27m 27s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 34s
Formatting and code style with Black + ruff	1m 54s
Type check our own code (py310-windows-64)	2m 29s
Type check our own code (py310-ubuntu)	1m 40s
Parallel tests with py314-ubuntu, interpreted	23m 26s
	3h 6m 31s

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