Update to fix compile error

com.unity.perception/Tests/Runtime/GroundTruthTests/KeypointGroundTruthTests.cs

 using NUnit.Framework;
 using UnityEngine;
 using UnityEngine.Perception.GroundTruth;
-using UnityEngine.Rendering.Universal;
 using UnityEngine.SceneManagement;
 using UnityEngine.TestTools;