mypy

gh-139434: Update selected RFC 2822 references to RFC 5322 (#139435) #17689

Job	Run time
Run mypy on Lib/test/libregrtest	21s
Run mypy on Lib/_pyrepl	16s
Run mypy on Tools/cases_generator	18s
Run mypy on Lib/tomllib	19s
Run mypy on Tools/peg_generator	23s
Run mypy on Tools/jit	17s
Run mypy on Tools/build	20s
Run mypy on Tools/clinic	18s
	2m 32s

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