mypy

gh-146589: Fix raw buffer merge in UnixConsole.getpending() #20251

Job	Run time
Run mypy on Lib/test/libregrtest	17s
Run mypy on Lib/tomllib	21s
Run mypy on Tools/jit	18s
Run mypy on Tools/peg_generator	18s
Run mypy on Tools/clinic	18s
Run mypy on Lib/_pyrepl	17s
Run mypy on Tools/build	17s
Run mypy on Tools/check-c-api-docs	17s
Run mypy on Tools/cases_generator	20s
	2m 43s

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