mypy

gh-136186: Fix more flaky tests in test_external_inspection (#143235) #18775

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

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