Tests

[mypyc] Add efficient librt.base64.b64decode #19424

Job	Run time
Test mypyc suite with 32-bit Python	8m 37s
Test suite with py311-ubuntu	9m 22s
Test suite with py314-ubuntu, mypyc-compiled	15m 3s
Test suite with py312-ubuntu, mypyc-compiled	14m 51s
Type check our own code (py39-windows-64)	2m 31s
mypyc runtime tests with py310-ubuntu	4m 45s
Formatting and code style with Black + ruff	1m 49s
Test suite with py314-windows-64	26m 40s
Test suite with py310-ubuntu	13m 2s
Type check our own code (py39-ubuntu)	1m 41s
Test suite with py313-ubuntu, mypyc-compiled	14m 31s
mypyc runtime tests with py313-macos	3m 58s
Test suite with py39-ubuntu, mypyc-compiled	15m 54s
	2h 12m 44s

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