mypy

gh-144492: Fix `process_changed_files` outputs for `reusable-{macos, … #19452

Job	Run time
Run mypy on Tools/clinic	17s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Lib/_pyrepl	21s
Run mypy on Tools/cases_generator	21s
Run mypy on Tools/build	19s
Run mypy on Tools/jit	20s
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Lib/tomllib	19s
Run mypy on Tools/peg_generator	20s
	2m 56s

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