Reconfigured allowed ofType depth

Author: michaelstaib

src/HotChocolate/Core/src/Validation/Rules/IntrospectionDepthVisitor.cs

@@ -20,7 +20,7 @@ private readonly (FieldCoordinate Coordinate, ushort MaxAllowed)[] _limits =
             (new FieldCoordinate("__Type", "inputFields"), 1),
             (new FieldCoordinate("__Type", "interfaces"), 1),
             (new FieldCoordinate("__Type", "possibleTypes"), 1),
-            (new FieldCoordinate("__Type", "ofType"), 8),
+            (new FieldCoordinate("__Type", "ofType"), 16),
         };
 
     protected override ISyntaxVisitorAction Enter(