mypy

gh-136186: Fix flaky tests in test_external_inspection (#143110) #18735

Job	Run time
Run mypy on Lib/tomllib	20s
Run mypy on Tools/check-c-api-docs	17s
Run mypy on Lib/_pyrepl	20s
Run mypy on Tools/build	20s
Run mypy on Tools/cases_generator	17s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Tools/peg_generator	21s
Run mypy on Tools/clinic	21s
Run mypy on Tools/jit	18s
	2m 55s

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