Removed unused library

Author: michalChrobot

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

@@ -5,7 +5,6 @@
 using Unity.Netcode.Components;
 using Unity.Netcode.TestHelpers.Runtime;
 using UnityEngine;
-using UnityEngine.TestTools;
 using UnityEngine.TestTools.Utils;
 using Object = UnityEngine.Object;