style

Removing using directive not being used,

Author: NoelStephensUnity

com.unity.netcode.gameobjects/Tests/Runtime/ConnectionApprovalTimeoutTests.cs

@@ -2,7 +2,6 @@
 using System.Text.RegularExpressions;
 using NUnit.Framework;
 using Unity.Netcode.TestHelpers.Runtime;
-using Unity.Netcode.Transports.UTP;
 using UnityEngine;
 using UnityEngine.TestTools;