fix: define _BACKUP_ITERATOR_DEBUG_LEVEL for MSVC 17.12+ compatibility#5957

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loumalouomega wants to merge 2 commits intopybind:masterfrom

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Commits on Jan 9, 2026

fix: Fixes compilation failure with MSVC 17.12 (v14.44) and C++20: '_BACKUP_ITERATOR_DEBUG_LEVEL' undeclared when including span header from STL.
loumalouomega
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style: pre-commit fixes
pre-commit-ci[bot]
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