Tests

[mypyc] Add `librt.strings.toupper` and `tolower` codepoint primitives #22428

Job	Run time
Test mypyc suite with 32-bit Python	11m 45s
Parallel tests with py314-ubuntu, mypyc-compiled	30m 19s
Test suite with py310-ubuntu, mypyc-compiled	16m 53s
mypyc runtime tests with py310-ubuntu	7m 27s
Test suite with py314t-ubuntu, mypyc-compiled	18m 11s
Test suite with py312-ubuntu	10m 14s
Test suite with py315-ubuntu, mypyc-compiled	16m 12s
Test suite with py314-windows-64	30m 1s
mypyc runtime tests with py313-macos	5m 36s
Test suite with py311-ubuntu	9m 57s
Test suite with py314-ubuntu, mypyc-compiled	17m 7s
Formatting and code style with Black + ruff	2m 2s
Type check our own code (py310-ubuntu)	1m 10s
Parallel tests with py314-windows-64, interpreted	10m 8s
Test suite with py313-ubuntu, mypyc-compiled	16m 53s
Parallel tests with py314-ubuntu, interpreted	27m 33s
Type check our own code (py310-windows-64)	2m 40s
	3h 54m 8s

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