Fix models-gateway checkout authentication in sync-openapi workflow (#55733)

Author: heiskr

.github/workflows/sync-openapi.yml

@@ -49,6 +49,7 @@ jobs:
           repository: github/models-gateway
           path: models-gateway
           ref: main
+          token: ${{ secrets.DOCS_BOT_PAT_BASE }}
 
       - uses: ./.github/actions/node-npm-setup