Tests

Fix `meet_types` for literal and instance #19807

Job	Run time
Test mypyc suite with 32-bit Python	9m 26s
Test suite with py313-ubuntu, mypyc-compiled	14m 37s
Test suite with py314t-ubuntu, mypyc-compiled	15m 59s
Test suite with py310-ubuntu, mypyc-compiled	14m 0s
Test suite with py314-ubuntu, mypyc-compiled	14m 35s
Test suite with py311-ubuntu	9m 6s
mypyc runtime tests with py310-ubuntu	5m 20s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 22s
Type check our own code (py310-ubuntu)	1m 41s
mypyc runtime tests with py313-macos	5m 18s
Test suite with py312-ubuntu	10m 7s
Test suite with py314-windows-64	26m 28s
Formatting and code style with Black + ruff	1m 59s
Parallel tests with py314-ubuntu, interpreted	23m 51s
Type check our own code (py310-windows-64)	2m 52s
	3h 4m 41s

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