[PPV2] Remove PVRTC support (#8168)

* Remove PVRTC support on Unity 6.1 and newer

* Update CHANGELOG

Author: BenGraterUnity

com.unity.postprocessing/CHANGELOG.md

@@ -10,7 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Added Switch2 platform support
 
 ### Fixed
-- 
+- Remove support for PVRTC format in Unity 6.1 or newer
 
 ## [3.4.0] - 2023-12-11
 

com.unity.postprocessing/PostProcessing/Runtime/Utils/TextureFormatUtilities.cs

@@ -45,10 +45,12 @@ static TextureFormatUtilities()
                 { (int)TextureFormat.DXT1Crunched, RenderTextureFormat.ARGB32 },
                 { (int)TextureFormat.DXT5Crunched, RenderTextureFormat.ARGB32 },
             #endif
+            #if !UNITY_6000_1_OR_NEWER
                 { (int)TextureFormat.PVRTC_RGB2, RenderTextureFormat.ARGB32 },
                 { (int)TextureFormat.PVRTC_RGBA2, RenderTextureFormat.ARGB32 },
                 { (int)TextureFormat.PVRTC_RGB4, RenderTextureFormat.ARGB32 },
                 { (int)TextureFormat.PVRTC_RGBA4, RenderTextureFormat.ARGB32 },
+            #endif
             #if !UNITY_2018_1_OR_NEWER
                 { (int)TextureFormat.ATC_RGB4, RenderTextureFormat.ARGB32 },
                 { (int)TextureFormat.ATC_RGBA8, RenderTextureFormat.ARGB32 },