Fixed getting scene item id from OBS.

OBS/Socket/Data/RequestResponseMessage.cs

@@ -5,6 +5,6 @@ namespace TwitchChatTTS.OBS.Socket.Data
         public required string RequestType { get; set; }
         public required string RequestId { get; set; }
         public required object RequestStatus { get; set; }
-        public required Dictionary<string, object> ResponseData { get; set; }
+        public Dictionary<string, object>? ResponseData { get; set; }
     }
 }