Tests

[mypyc] librt base64: use existing SIMD CPU dispatch by customizing b… #19512

Job	Run time
Test mypyc suite with 32-bit Python	8m 43s
Test suite with py312-ubuntu, mypyc-compiled	14m 26s
Test suite with py311-ubuntu	9m 6s
Test suite with py310-ubuntu	12m 31s
Test suite with py39-ubuntu, mypyc-compiled	14m 52s
Test suite with py314-ubuntu, mypyc-compiled	14m 32s
Test suite with py313-ubuntu, mypyc-compiled	13m 17s
Test suite with py314-windows-64	26m 14s
mypyc runtime tests with py310-ubuntu	4m 57s
mypyc runtime tests with py313-macos	4m 53s
Type check our own code (py39-ubuntu)	1m 43s
Formatting and code style with Black + ruff	1m 54s
Type check our own code (py39-windows-64)	2m 27s
	2h 9m 35s

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