mypy

gh-69113: Fix doctest to report line numbers for test strings (#1… #18308

Job	Run time
Run mypy on Tools/build	18s
Run mypy on Lib/_pyrepl	18s
Run mypy on Tools/cases_generator	22s
Run mypy on Lib/tomllib	20s
Run mypy on Lib/test/libregrtest	20s
Run mypy on Tools/clinic	17s
Run mypy on Tools/peg_generator	17s
Run mypy on Tools/jit	18s
	2m 30s

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