Update parse_server_sdk minimum level

Author: kirkmorrow

packages/flutter/pubspec.yaml

@@ -25,7 +25,7 @@ dependencies:
   flutter:
     sdk: flutter
 
-  parse_server_sdk: ">=6.4.0 <10.0.0"
+  parse_server_sdk: ">=9.4.2 <10.0.0"
   # Uncomment for local testing
   #parse_server_sdk:
   #   path: ../dart