bulk load CDK auto upgrade cron: use app token instead of GITHUB_TOKEN (#69179)

Author: edgao

.github/workflows/auto-upgrade-certified-connectors-cdk.yml

@@ -65,7 +65,7 @@ jobs:
       - name: Checkout Airbyte
         uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
         with:
-          token: ${{ secrets.GITHUB_TOKEN }}
+          token: ${{ steps.app-token.outputs.token }}
           # Needed for when airbyte-enterprise calls this workflow
           submodules: true