Prioritize DependencyObject over INPC for UNO

src/ReactiveUI/Platforms/uap/DependencyObjectObservableForProperty.cs

@@ -37,7 +37,13 @@ namespace ReactiveUI
                 return 0;
             }
 
+#if HAS_UNO
+            // DependencyObject must be prioritized compared to INotifyPropertyChanged (score == 5)
+            // until https://github.com/unoplatform/uno/issues/1551 is resolved.
+            return 6; 
+#else
             return 4;
+#endif
         }
 
         /// <inheritdoc/>