mypy

gh-153417: Fix BytesWarning in imaplib error messages for bytes argum… #22411

Job	Run time
Run mypy on Lib/tomllib	31s
Run mypy on Tools/build	27s
Run mypy on Tools/clinic	31s
Run mypy on Lib/_pyrepl	35s
Run mypy on Tools/peg_generator	34s
Run mypy on Tools/check-c-api-docs	34s
Run mypy on Tools/cases_generator	32s
Run mypy on Tools/jit	33s
Run mypy on Lib/test/libregrtest	31s
	4m 48s

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