Tests

[mypyc] Remove experimental flag from bytes get item ops #20109

Job	Run time
Test mypyc suite with 32-bit Python	9m 46s
Test suite with py313-ubuntu, mypyc-compiled	14m 34s
Test suite with py310-ubuntu, mypyc-compiled	15m 38s
Test suite with py312-ubuntu	10m 2s
Type check our own code (py310-windows-64)	2m 26s
Test suite with py311-ubuntu	9m 21s
Test suite with py314-windows-64	27m 44s
Formatting and code style with Black + ruff	1m 56s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 23s
Parallel tests with py314-ubuntu, interpreted	23m 41s
Test suite with py314t-ubuntu, mypyc-compiled	17m 37s
Test suite with py314-ubuntu, mypyc-compiled	15m 4s
mypyc runtime tests with py310-ubuntu	5m 40s
Type check our own code (py310-ubuntu)	1m 34s
mypyc runtime tests with py313-macos	5m 55s
	3h 8m 21s

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