style

removing a using statement for a namespace that was not being used.

Author: NoelStephensUnity

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

@@ -1,7 +1,6 @@
 using System.Collections;
 using System.Collections.Generic;
 using NUnit.Framework;
-using UnityEngine;
 using UnityEngine.TestTools;
 
 namespace Unity.Netcode.RuntimeTests