mypy

gh-142206: multiprocessing.resource_tracker: Decode messages using ol… #18225

Job	Run time
Run mypy on Tools/clinic	16s
Run mypy on Tools/peg_generator	18s
Run mypy on Lib/_pyrepl	20s
Run mypy on Tools/build	19s
Run mypy on Lib/tomllib	19s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Tools/jit	20s
Run mypy on Tools/cases_generator	18s
	2m 29s

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