fix issue: 'UdpClientWrapper' - await CancelAsync instead of Cancel in async method

Author: Dark927

NetSdrClientApp/Networking/UdpClientWrapper.cs

@@ -47,7 +47,7 @@ public async Task StartListeningAsync()
             }
             finally
             {
-                _cts?.Cancel();
+                await _cts?.CancelAsync();
                 _cts?.Dispose();
             }
         }