mypy

gh-120158: Fix inconsistent monitoring state when setting events too … #18102

Job	Run time
Run mypy on Lib/_pyrepl	19s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Tools/clinic	17s
Run mypy on Lib/tomllib	19s
Run mypy on Tools/peg_generator	17s
Run mypy on Tools/build	18s
Run mypy on Tools/cases_generator	22s
Run mypy on Tools/jit	18s
	2m 28s

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