mypy

gh-145235: Make dict watcher API thread-safe for free-threaded builds… #21277

Job	Run time
Run mypy on Lib/_pyrepl	46s
Run mypy on Tools/build	42s
Run mypy on Lib/tomllib	45s
Run mypy on Lib/test/libregrtest	46s
Run mypy on Tools/clinic	41s
Run mypy on Tools/check-c-api-docs	40s
Run mypy on Tools/jit	47s
Run mypy on Tools/cases_generator	46s
Run mypy on Tools/peg_generator	39s
	6m 32s

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