[3.13] Docs: Synchronise ``indexsidebar.html`` with docsbuild-scripts (GH-132567)#132573

AA-Turner merged 1 commit intopython:3.13python/cpython:3.13from

miss-islington:backport-4f10b93-3.13miss-islington/cpython:backport-4f10b93-3.13Copy head branch name to clipboard