ci(openapi-update): use @octokit personal access token to trigger test CI

Author: gr2m

.github/workflows/update.yml

@@ -22,7 +22,7 @@ jobs:
       - name: Create Pull Request
         uses: gr2m/[email protected]
         env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.OCTOKITBOT_PAT }}
         with:
           title: "🚧 GitHub REST API Endpoints changed"
           body: |