mypy

Drop historical `:author:`s from HOWTOs (#151091) #21837

Job	Run time
Run mypy on Lib/_pyrepl	22s
Run mypy on Tools/build	21s
Run mypy on Tools/jit	22s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Tools/peg_generator	21s
Run mypy on Tools/clinic	21s
Run mypy on Lib/tomllib	18s
Run mypy on Tools/cases_generator	20s
Run mypy on Tools/check-c-api-docs	19s
	3m 5s

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