mypy

gh-143429: Use compile-time NaN encoding detection for test_struct (#… #10045

Job	Run time
Run mypy on Tools/peg_generator	17s
Run mypy on Tools/check-c-api-docs	17s
Run mypy on Lib/_pyrepl	17s
Run mypy on Tools/cases_generator	14s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/clinic	18s
Run mypy on Tools/jit	21s
Run mypy on Tools/build	17s
Run mypy on Lib/test/libregrtest	19s
	2m 37s

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