mypy

gh-68147: Fix RFC references in imaplib (GH-153126) #22331

Job	Run time
Run mypy on Tools/peg_generator	24s
Run mypy on Tools/build	29s
Run mypy on Lib/_pyrepl	29s
Run mypy on Tools/clinic	30s
Run mypy on Tools/check-c-api-docs	30s
Run mypy on Tools/jit	31s
Run mypy on Tools/cases_generator	29s
Run mypy on Lib/tomllib	30s
Run mypy on Lib/test/libregrtest	30s
	4m 22s

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