code: def update_api_key(self, api_key):
      self._header[API_KEY_HEADER_NAME] = api_key
  
file_path: argilla/tests/integration/helpers.py
imports: from argilla._constants import API_KEY_HEADER_NAME, WORKSPACE_HEADER_NAME
  from argilla.server.models import User
  from fastapi import FastAPI
  from starlette.testclient import TestClient
label_desc: Use image node_id 2 for calling the SecuredClient obj's underlying member method code with example usage: obj.update_api_key(api_key) without return types