mypy

gh-140824: Fix _Py_DumpExtensionModules() to ignore sub-modules (#144… #19383

Job	Run time
Run mypy on Lib/test/libregrtest	21s
Run mypy on Tools/check-c-api-docs	16s
Run mypy on Lib/tomllib	17s
Run mypy on Lib/_pyrepl	23s
Run mypy on Tools/cases_generator	21s
Run mypy on Tools/peg_generator	20s
Run mypy on Tools/build	19s
Run mypy on Tools/clinic	19s
Run mypy on Tools/jit	19s
	2m 55s

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