chore(ci): use DEPENDABOT_AUTOMERGE_TOKEN if available for automerge

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

@@ -23,6 +23,7 @@ jobs:
           steps.metadata.outputs.update-type == 'version-update:semver-patch'
         uses: actions/github-script@v7
         with:
+          github-token: ${{ secrets.DEPENDABOT_AUTOMERGE_TOKEN != '' && secrets.DEPENDABOT_AUTOMERGE_TOKEN || secrets.GITHUB_TOKEN }}
           script: |
             await github.pulls.createReview({
               owner: context.repo.owner,
@@ -37,6 +38,6 @@ jobs:
           steps.metadata.outputs.update-type == 'version-update:semver-patch'
         uses: peter-evans/enable-pull-request-automerge@v3
         with:
-          token: ${{ secrets.GITHUB_TOKEN }}
+          token: ${{ secrets.DEPENDABOT_AUTOMERGE_TOKEN != '' && secrets.DEPENDABOT_AUTOMERGE_TOKEN || secrets.GITHUB_TOKEN }}
           merge-method: squash