[3.13] gh-146613: Fix re-entrant use-after-free in itertools._grouper (GH-147962)#148011

Yhg1s merged 1 commit intopython:3.13python/cpython:3.13from

miss-islington:backport-fc7a188-3.13miss-islington/cpython:backport-fc7a188-3.13Copy head branch name to clipboard