ci: bump stefanzweifel/git-auto-commit-action from 5 to 6 #6

Bumps [stefanzweifel/git-auto-commit-action](https://github.com/stefanzweifel/git-auto-commit-action) from 5 to 6.
- [Release notes](https://github.com/stefanzweifel/git-auto-commit-action/releases)
- [Changelog](https://github.com/stefanzweifel/git-auto-commit-action/blob/master/CHANGELOG.md)
- [Commits](stefanzweifel/git-auto-commit-action@v5...v6)

---
updated-dependencies:
- dependency-name: stefanzweifel/git-auto-commit-action
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/backup.yml

@@ -26,7 +26,7 @@ jobs:
     - name: Update backups
       run: github-backup neovim --exclude neovim-backup winget-pkgs --token ${{ secrets.PAT }} --fork --incremental --issues --issue-comments --pulls --pull-comments
     - name: Push changes
-      uses: stefanzweifel/git-auto-commit-action@v5
+      uses: stefanzweifel/git-auto-commit-action@v6
       with:
         commit_message: Backup update
         commit_user_name: marvim