mypy

Add 'Show translation source' to docs sidebar (#130355) #9944

Job	Run time
Run mypy on Tools/clinic	19s
Run mypy on Tools/cases_generator	16s
Run mypy on Lib/_pyrepl	17s
Run mypy on Lib/tomllib	19s
Run mypy on Tools/jit	17s
Run mypy on Tools/build	17s
Run mypy on Tools/peg_generator	17s
Run mypy on Lib/test/libregrtest	19s
	2m 21s

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