mypy

gh-127012: `Traversable.read_text` now allows/solicits an `errors` pa… #20630

Job	Run time
Run mypy on Tools/build	17s
Run mypy on Tools/check-c-api-docs	21s
Run mypy on Lib/tomllib	15s
Run mypy on Lib/_pyrepl	17s
Run mypy on Tools/jit	18s
Run mypy on Lib/test/libregrtest	16s
Run mypy on Tools/clinic	16s
Run mypy on Tools/cases_generator	29s
Run mypy on Tools/peg_generator	16s
	2m 45s

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