fixed dep resolution example

Signed-off-by: Vincenzo Palazzo <[email protected]>

Author: vincenzopalazzo

examples/starwars/pubspec.yaml

@@ -11,8 +11,7 @@ dependencies:
     sdk: flutter
   graphql_flutter:
     path: ../../packages/graphql_flutter
-  graphql:
-    path: ../../packages/graphql
+  graphql: ^5.1.2-beta.1
   universal_platform:
     ^0.1.3
     # https://github.com/flutter/flutter/issues/36126#issuecomment-596215587