Update flavor url endpoint

Author: branflake2267

client/lib/main.dart

@@ -4,7 +4,7 @@ import 'MyApp.dart';
 
 void main() {
   FlavorConfig(environment: FlavorEnvironment.PROD, variables: {
-    "baseUrl": "http://dartserver-staging-v1.eba-rhptv8q6.us-west-2.elasticbeanstalk.com",
+    "baseUrl": "https://donnelson-sandbox-flex.appspot.com",
   });
 
   runApp(MyApp());