mypy

gh-151556: Show example CSV file content in the `csv` module docs (#1… #22039

Job	Run time
Run mypy on Tools/cases_generator	28s
Run mypy on Lib/_pyrepl	18s
Run mypy on Tools/jit	18s
Run mypy on Tools/build	20s
Run mypy on Tools/peg_generator	23s
Run mypy on Tools/clinic	23s
Run mypy on Tools/check-c-api-docs	28s
Run mypy on Lib/tomllib	17s
Run mypy on Lib/test/libregrtest	19s
	3m 14s

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