mypy

gh-150662: Stop unbounded memory growth in Tachyon `--gecko` collecto… #21749

Job	Run time
Run mypy on Tools/build	18s
Run mypy on Lib/_pyrepl	18s
Run mypy on Tools/cases_generator	16s
Run mypy on Tools/jit	19s
Run mypy on Lib/tomllib	16s
Run mypy on Lib/test/libregrtest	16s
Run mypy on Tools/check-c-api-docs	21s
Run mypy on Tools/peg_generator	19s
Run mypy on Tools/clinic	18s
	2m 41s

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