remove unused ns

Author: beto-rodriguez

samples/ViewModelsSamples/Axes/Paging/ViewModel.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;