[Fix] Receiving voice packets (use system-assigned port) (#2857)

* Voice receive fix (use system-selected port)

* Update SocketGuild.cs

---------

Co-authored-by: Misha133 <mihagribkov133@gmail.com>

src/Discord.Net.WebSocket/DiscordVoiceApiClient.cs

@@ -143,7 +143,7 @@ namespace Discord.Audio
             });
         }
 
-        public Task SendSelectProtocol(string externalIp, int externalPort)
+        public Task SendSelectProtocol(string externalIp)
         {
             return SendAsync(VoiceOpCode.SelectProtocol, new SelectProtocolParams
             {
@@ -151,7 +151,7 @@ namespace Discord.Audio
                 Data = new UdpProtocolInfo
                 {
                     Address = externalIp,
-                    Port = externalPort,
+                    Port = UdpPort,
                     Mode = Mode
                 }
             });