mypy

gh-143689: Fix BufferedReader.read1 leaving object in reentrant state… #19171

Job	Run time
Run mypy on Lib/test/libregrtest	22s
Run mypy on Tools/build	21s
Run mypy on Lib/_pyrepl	21s
Run mypy on Lib/tomllib	21s
Run mypy on Tools/clinic	23s
Run mypy on Tools/check-c-api-docs	20s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/peg_generator	21s
Run mypy on Tools/jit	17s
	3m 4s

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