mypy

gh-137646: update actions/checkouts to v5 #16098

Job	Run time
Run mypy on Tools/build	19s
Run mypy on Lib/test/libregrtest	20s
Run mypy on Tools/peg_generator	19s
Run mypy on Lib/_pyrepl	20s
Run mypy on Tools/clinic	17s
Run mypy on Tools/cases_generator	15s
Run mypy on Tools/jit	19s
Run mypy on Lib/tomllib	20s
	2m 29s

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