chore(deps): bump stefanzweifel/git-auto-commit-action from 5 to 6 (ietf-tools#9007)

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
...

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

Author: dependabot[bot]

.github/workflows/build-base-app.yml

@@ -59,7 +59,7 @@ jobs:
         echo "${{ env.IMGVERSION }}" > dev/build/TARGET_BASE
 
     - name: Commit CHANGELOG.md
-      uses: stefanzweifel/git-auto-commit-action@v5
+      uses: stefanzweifel/git-auto-commit-action@v6
       with:
         branch: ${{ github.ref_name }}
         commit_message: 'ci: update base image target version to ${{ env.IMGVERSION }}'