Tests

Remove --force-uppercase-builtins flag #19753

Job	Run time
Test mypyc suite with 32-bit Python	9m 3s
Test suite with py311-ubuntu	8m 42s
Test suite with py310-ubuntu, mypyc-compiled	13m 39s
Test suite with py314-ubuntu, mypyc-compiled	14m 8s
Type check our own code (py310-windows-64)	2m 17s
Parallel tests with py314-ubuntu, mypyc-compiled	26m 2s
mypyc runtime tests with py313-macos	5m 14s
Test suite with py313-ubuntu, mypyc-compiled	13m 15s
Test suite with py314t-ubuntu, mypyc-compiled	15m 45s
Formatting and code style with Black + ruff	1m 57s
Type check our own code (py310-ubuntu)	1m 45s
mypyc runtime tests with py310-ubuntu	5m 13s
Parallel tests with py314-ubuntu, interpreted	23m 52s
Test suite with py314-windows-64	26m 50s
Test suite with py312-ubuntu	9m 56s
	2h 57m 38s

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