Return a new list from `WebRequestResources`.

Otherwise, the content in `Resources` may return inconsistent data.

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bundling/Volo/Abp/AspNetCore/Mvc/UI/Resources/WebRequestResources.cs

@@ -30,6 +30,6 @@ public class WebRequestResources : IWebRequestResources, IScopedDependency
         }
 
         Resources.Add(path, resources);
-        return resources;
+        return resources.ToList();
     }
 }