mypy

gh-150361: add test for FlowControlMixin pause_writing exception hand… #22762

Job	Run time
Run mypy on Lib/tomllib	29s
Run mypy on Tools/cases_generator	32s
Run mypy on Tools/peg_generator	31s
Run mypy on Lib/_pyrepl	30s
Run mypy on Lib/test/libregrtest	36s
Run mypy on Tools/build	29s
Run mypy on Tools/clinic	31s
Run mypy on Tools/check-c-api-docs	29s
Run mypy on Tools/jit	31s
	4m 38s

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