Tests

[mypyc] Fix refleak in str index #21773

Job	Run time
Test mypyc suite with 32-bit Python	10m 49s
Parallel tests with py314-ubuntu, interpreted	25m 1s
Test suite with py313-ubuntu, mypyc-compiled	15m 36s
Test suite with py314-windows-64	29m 8s
Test suite with py312-ubuntu	9m 27s
Test suite with py314-ubuntu, mypyc-compiled	15m 55s
Test suite with py311-ubuntu	9m 8s
Test suite with py310-ubuntu, mypyc-compiled	16m 44s
mypyc runtime tests with py310-ubuntu	6m 43s
mypyc runtime tests with py313-macos	6m 5s
Parallel tests with py314-windows-64, interpreted	7m 56s
Parallel tests with py314-ubuntu, mypyc-compiled	25m 32s
Type check our own code (py310-ubuntu)	1m 7s
Type check our own code (py310-windows-64)	1m 57s
Formatting and code style with Black + ruff	1m 48s
Test suite with py314t-ubuntu, mypyc-compiled	17m 51s
	3h 20m 47s

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