mypy

gh-132631: Fix "I/O operation on closed file" when parsing JSON Lines… #10463

Job	Run time
Run mypy on Lib/_pyrepl	19s
Run mypy on Tools/peg_generator	18s
Run mypy on Tools/cases_generator	26s
Run mypy on Tools/check-c-api-docs	17s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Tools/clinic	20s
Run mypy on Tools/jit	23s
Run mypy on Tools/build	20s
Run mypy on Lib/tomllib	17s
	2m 59s

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