message: Use useApi not useApiHolder
diff: @@ -34,7 +34,7 @@ import {
  createSubRouteRef,
  createRoutableExtension,
  analyticsApiRef,
  - useApiHolder,
  + useApi,
  } from '@backstage/core-plugin-api';
  import { AppManager } from './AppManager';
  import { AppComponents, AppIcons } from './types';
  @@ -653,8 +653,7 @@ describe('Integration Test', () => {
  const Provider = app.getProvider();
  const ConfigDisplay = ({ configString }: { configString: string }) => {
  - const apiHolder = useApiHolder();
  - const config = apiHolder.get(configApiRef);
  + const config = useApi(configApiRef);
  return (
  <span>
  {configString}: {config?.getString(configString)}
  