update invoke image url

Author: mohnjiles

StabilityMatrix.Core/Models/Packages/InvokeAI.cs

@@ -52,7 +52,9 @@ IPipWheelService pipWheelService
     public override PackageDifficulty InstallerSortOrder => PackageDifficulty.Advanced;
 
     public override Uri PreviewImageUri =>
-        new("https://raw.githubusercontent.com/invoke-ai/InvokeAI/main/docs/assets/canvas_preview.png");
+        new(
+            "https://raw.githubusercontent.com/invoke-ai/InvokeAI/refs/heads/main/docs-old/assets/canvas_preview.png"
+        );
 
     public override IEnumerable<SharedFolderMethod> AvailableSharedFolderMethods =>
         [SharedFolderMethod.None, SharedFolderMethod.Configuration];