fix: Suppress stack trace log as intended in #257. (#260)

Author: bgrozev

src/main/java/org/ice4j/stack/NetAccessManager.java

@@ -628,7 +628,7 @@ void sendMessage(
         Connector ap = getConnector(srcAddr, remoteAddr);
         if (ap == null)
         {
-            throw new IllegalArgumentException("No socket found for " + srcAddr + "->" + remoteAddr);
+            throw new SocketNotFoundException("No socket found for " + srcAddr + "->" + remoteAddr);
         }
 
         ap.sendMessage(bytes, remoteAddr);