fix(AuthClient): Konvertiere den Rückgabetyp von ReceiveMessage von Nachricht zu

DigitalData.Auth.Client/AuthClient.cs

@@ -28,5 +28,5 @@ public class AuthClient : IAuthClient
 
     public async Task StartAsync() => await _connection.StartAsync();
 
-    public Task ReceiveMessage(string user, string message) => _params.Events.OnMessageReceived(user, message, _logger);
+    public void ReceiveMessage(string user, string message) => _params.Events.OnMessageReceived(user, message, _logger);
 }