mypy

gh-148406: Fix annotations of _colorize.FancyCompleter (#148408) #10445

Job	Run time
Run mypy on Lib/_pyrepl	17s
Run mypy on Lib/tomllib	16s
Run mypy on Lib/test/libregrtest	15s
Run mypy on Tools/check-c-api-docs	16s
Run mypy on Tools/build	20s
Run mypy on Tools/cases_generator	15s
Run mypy on Tools/jit	16s
Run mypy on Tools/peg_generator	12s
Run mypy on Tools/clinic	17s
	2m 24s

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