Tests

[mypyc] Fix refleak in str index #21770

Job	Run time
Test mypyc suite with 32-bit Python	8m 21s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 48s
Test suite with py314-windows-64	28m 25s
Test suite with py311-ubuntu	8m 57s
Test suite with py310-ubuntu, mypyc-compiled	16m 10s
Test suite with py312-ubuntu	9m 11s
Test suite with py313-ubuntu, mypyc-compiled	15m 54s
mypyc runtime tests with py310-ubuntu	6m 38s
mypyc runtime tests with py313-macos	10m 28s
Parallel tests with py314-ubuntu, interpreted	26m 16s
Test suite with py314t-ubuntu, mypyc-compiled	17m 6s
Type check our own code (py310-ubuntu)	1m 8s
Test suite with py314-ubuntu, mypyc-compiled	15m 33s
Type check our own code (py310-windows-64)	1m 52s
Formatting and code style with Black + ruff	1m 46s
Parallel tests with py314-windows-64, interpreted	8m 6s
	3h 23m 39s

Provide feedback