mypy

gh-146636: PEP 803: add Py_TARGET_ABI3T and .abi3t.so extension (GH-1… #20315

Job	Run time
Run mypy on Tools/jit	20s
Run mypy on Tools/peg_generator	17s
Run mypy on Lib/tomllib	18s
Run mypy on Tools/cases_generator	22s
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Lib/_pyrepl	17s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Tools/build	18s
Run mypy on Tools/clinic	19s
	2m 48s

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