code: def update_routes():
      return [
          {
              "name": "chat-gpt4",
              "route_type": "llm/v1/chat",
              "route_url": "/gateway/chat-gpt4/invocations",
              "model": {
                  "name": "gpt-4",
                  "provider": "openai",
              },
          },
      ]
  
file_path: mlflow/tests/gateway/test_runner.py
imports: from pathlib import Path
  import pytest
  from tests.gateway.tools import Gateway, save_yaml
label_desc: Use image node_id 4 for calling a global function with example usage: update_routes() and returns: list