Tests

[mypyc] Replace deprecated _PY_IDENTIFIER uses #19843

Job	Run time
Test mypyc suite with 32-bit Python	9m 4s
Test suite with py312-ubuntu	9m 54s
Test suite with py311-ubuntu	8m 58s
Parallel tests with py314-ubuntu, interpreted	23m 24s
Test suite with py310-ubuntu, mypyc-compiled	14m 56s
Test suite with py314t-ubuntu, mypyc-compiled	16m 44s
Type check our own code (py310-ubuntu)	1m 45s
mypyc runtime tests with py310-ubuntu	5m 4s
Parallel tests with py314-ubuntu, mypyc-compiled	26m 27s
mypyc runtime tests with py313-macos	5m 43s
Test suite with py314-windows-64	28m 32s
Type check our own code (py310-windows-64)	3m 0s
Test suite with py313-ubuntu, mypyc-compiled	13m 31s
Formatting and code style with Black + ruff	1m 58s
Test suite with py314-ubuntu, mypyc-compiled	14m 4s
	3h 3m 4s

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