fix: approval needs to be done by CI bot (#967)

Author: RobPasMue

.github/workflows/dependabot_automerge.yml

@@ -20,7 +20,7 @@ jobs:
         run: gh pr review --approve "$PR_URL"
         env:
           PR_URL: ${{github.event.pull_request.html_url}}
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_TOKEN: ${{ secrets.PYANSYS_CI_BOT_TOKEN }}
 
       - name: Enable auto-merge for Dependabot PRs
         if: steps.metadata.outputs.update-type != 'version-update:semver-major'