Try to fix AttachedEventDemo in .NET 8

Author: Numpsy

src/Avalonia.FuncUI.ControlCatalog/Avalonia.FuncUI.ControlCatalog/Views/Tabs/AttachedEventDemo.fs

@@ -38,7 +38,7 @@ module AttachedEventDemo =
         | :? 't as t when t.Name = name -> Some t
         | _ -> None
 
-    let sprintRoutedEvent (s: #Interactive) (e: #RoutedEventArgs) =
+    let sprintRoutedEvent (s: Interactive) (e: #RoutedEventArgs) =
         let time = System.DateTime.Now.ToString ("HH:mm:ss.fff")
 
         let sender =