fixed HDRP warnings

com.unity.render-pipelines.high-definition/HDRP/Editor/AssetPostProcessors/NormalMapVarianceTexturePostprocessor.cs

             textureImporter.convertToNormalmap = false;
             textureImporter.textureCompression = TextureImporterCompression.CompressedHQ;
 
+#pragma warning disable 618 // remove obsolete warning for this one
+#pragma warning restore 618
             textureImporter.sRGBTexture = false;  // But we're setting the new property just in case it changes later...
         }
     }

com.unity.render-pipelines.high-definition/HDRP/Lighting/LightLoop/LightLoop.cs

             {
                 var camera = hdCamera.camera;
 
-                var ssReflection = VolumeManager.instance.stack.GetComponent<ScreenSpaceReflection>() ?? ScreenSpaceReflection.@default;
-
                 // Compute path
                 if (m_FrameSettings.lightLoopSettings.enableTileAndCluster && m_FrameSettings.lightLoopSettings.enableComputeLightEvaluation)
                 {