mypy

gh-150387: Fix hang in test_run_failed_script_live on slow buildbots … #21556

Job	Run time
Run mypy on Tools/check-c-api-docs	16s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/peg_generator	19s
Run mypy on Tools/build	19s
Run mypy on Tools/cases_generator	19s
Run mypy on Tools/clinic	21s
Run mypy on Lib/_pyrepl	20s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Tools/jit	20s
	2m 50s

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