Tests

Fix `meet_types` for literal and instance #19815

Job	Run time
Test suite with py314-ubuntu, mypyc-compiled	13m 34s
mypyc runtime tests with py310-ubuntu	5m 11s
mypyc runtime tests with py313-macos	5m 46s
Test mypyc suite with 32-bit Python	9m 23s
Test suite with py312-ubuntu	10m 25s
Test suite with py311-ubuntu	9m 6s
Test suite with py314t-ubuntu, mypyc-compiled	16m 24s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 57s
Parallel tests with py314-ubuntu, interpreted	24m 38s
Test suite with py314-windows-64	27m 39s
Test suite with py313-ubuntu, mypyc-compiled	14m 1s
Type check our own code (py310-ubuntu)	1m 45s
Formatting and code style with Black + ruff	2m 24s
Test suite with py310-ubuntu, mypyc-compiled	13m 59s
Type check our own code (py310-windows-64)	2m 26s
	3h 4m 38s

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