mypy

gh-123441: Correct the supported languages of the iso-8859-4 codec (G… #16023

Job	Run time
Run mypy on Lib/_pyrepl	15s
Run mypy on Lib/test/libregrtest	32s
Run mypy on Lib/tomllib	19s
Run mypy on Tools/peg_generator	22s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/clinic	23s
Run mypy on Tools/jit	20s
Run mypy on Tools/build	31s
	3m 0s

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