ci(gh actions): auto-merge wf to use PAT and rebase method

Author: KaiSchwarz-cnic

.github/workflows/auto-merge-dependabot-pr.yml

@@ -29,7 +29,7 @@ jobs:
       - name: Enable auto-merge for Dependabot PRs
         # (fixes, features but not major upgrades!)
         if: ${{steps.metadata.outputs.update-type == 'version-update:semver-patch' || steps.metadata.outputs.update-type == 'version-update:semver-minor'}}
-        run: gh pr merge --auto --merge "$PR_URL"
+        run: gh pr merge --auto -d -r "$PR_URL"
         env:
           PR_URL: ${{github.event.pull_request.html_url}}
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.RTLDEV_MW_CI_TOKEN }}