mypy

gh-141004: Don't trigger `run-tests` when `Tools/check-c-api-docs/ignored_c_api.txt` is changed #19000

Job	Run time
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Lib/test/libregrtest	22s
Run mypy on Tools/cases_generator	15s
Run mypy on Tools/peg_generator	19s
Run mypy on Tools/clinic	20s
Run mypy on Lib/_pyrepl	18s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/jit	20s
Run mypy on Tools/build	17s
	2m 46s

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