Backport pull request #12415 from jellyfin/release-10.9.z

Include AVIF extension for support images

Original-merge: 5027e3cd53455f55a67fa018aaf881ca4fa4eecd

Merged-by: crobibero <cody@robibe.ro>

Backported-by: Joshua M. Boniface <joshua@boniface.me>

src/Jellyfin.Drawing/ImageProcessor.cs

@@ -102,7 +102,8 @@ public sealed class ImageProcessor : IImageProcessor, IDisposable
             "astc",
             "ktx",
             "pkm",
-            "wbmp"
+            "wbmp",
+            "avif"
         };
 
     /// <inheritdoc />