mypy

gh-122575: gh-142349: fix sys.flags tuple size (it unintentionally in… #19963

Job	Run time
Run mypy on Tools/peg_generator	21s
Run mypy on Tools/check-c-api-docs	17s
Run mypy on Tools/cases_generator	19s
Run mypy on Lib/test/libregrtest	16s
Run mypy on Lib/_pyrepl	19s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/build	18s
Run mypy on Tools/clinic	15s
Run mypy on Tools/jit	19s
	2m 41s

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