PluginLoader: fix imports for react-redux (#19780)

public/app/features/plugins/plugin_loader.ts

@@ -15,8 +15,8 @@ import slateReact from '@grafana/slate-react';
 import slatePlain from 'slate-plain-serializer';
 import react from 'react';
 import reactDom from 'react-dom';
-import reactRedux from 'react-redux';
-import redux from 'redux';
+import * as reactRedux from 'react-redux';
+import * as redux from 'redux';
 
 import config from 'app/core/config';
 import TimeSeries from 'app/core/time_series2';