Tests

[mypyc] Replace deprecated _PY_IDENTIFIER uses #19840

Job	Run time
Test mypyc suite with 32-bit Python	9m 13s
Test suite with py314-ubuntu, mypyc-compiled	13m 28s
Test suite with py311-ubuntu	9m 1s
Test suite with py314t-ubuntu, mypyc-compiled	16m 5s
Test suite with py310-ubuntu, mypyc-compiled	14m 4s
Test suite with py313-ubuntu, mypyc-compiled	13m 42s
Formatting and code style with Black + ruff	1m 58s
Test suite with py314-windows-64	26m 39s
mypyc runtime tests with py310-ubuntu	5m 3s
Type check our own code (py310-windows-64)	3m 24s
mypyc runtime tests with py313-macos	6m 3s
Test suite with py312-ubuntu	10m 3s
Type check our own code (py310-ubuntu)	1m 40s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 24s
Parallel tests with py314-ubuntu, interpreted	22m 23s
	3h 0m 10s

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