mypy

gh-130472: Remove readline-only hacks from PyREPL completions #20454

Job	Run time
Run mypy on Tools/peg_generator	15s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/check-c-api-docs	15s
Run mypy on Lib/tomllib	16s
Run mypy on Lib/test/libregrtest	17s
Run mypy on Tools/build	16s
Run mypy on Tools/clinic	16s
Run mypy on Lib/_pyrepl	21s
Run mypy on Tools/jit	20s
	2m 34s

Provide feedback