mypy

gh-144027: Fix documentation for ignorechars in base64.a85decode() (G… #19238

Job	Run time
Run mypy on Tools/build	18s
Run mypy on Tools/jit	19s
Run mypy on Lib/_pyrepl	23s
Run mypy on Tools/clinic	18s
Run mypy on Lib/tomllib	20s
Run mypy on Tools/cases_generator	18s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Tools/peg_generator	19s
Run mypy on Tools/check-c-api-docs	28s
	3m 2s

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