Tests

Mark more things as literals #20358

Job	Run time
Test mypyc suite with 32-bit Python	9m 25s
mypyc runtime tests with py313-macos	5m 43s
Test suite with py311-ubuntu	9m 40s
Formatting and code style with Black + ruff	1m 54s
Test suite with py314-windows-64	27m 57s
Test suite with py314-ubuntu, mypyc-compiled	15m 35s
Type check our own code (py310-windows-64)	2m 59s
Test suite with py313-ubuntu, mypyc-compiled	14m 34s
Type check our own code (py310-ubuntu)	1m 31s
mypyc runtime tests with py310-ubuntu	5m 22s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 31s
Test suite with py314t-ubuntu, mypyc-compiled	18m 8s
Test suite with py310-ubuntu, mypyc-compiled	14m 59s
Parallel tests with py314-ubuntu, interpreted	22m 1s
Test suite with py312-ubuntu	9m 55s
	3h 9m 14s

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