mypy

gh-143055: Fix crash in AST unparser when unparsing dict comprehensio… #19839

Job	Run time
Run mypy on Lib/_pyrepl	49s
Run mypy on Tools/cases_generator	20s
Run mypy on Tools/jit	19s
Run mypy on Tools/check-c-api-docs	17s
Run mypy on Lib/tomllib	26s
Run mypy on Tools/peg_generator	17s
Run mypy on Tools/build	23s
Run mypy on Tools/clinic	21s
Run mypy on Lib/test/libregrtest	21s
	3m 33s

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