Fix update to update foreach Group (#14945)

src/Umbraco.Infrastructure/Migrations/Upgrade/V_14_0_0/AddGuidsToUserGroups.cs

@@ -46,9 +46,13 @@ public class AddGuidsToUserGroups : UnscopedMigrationBase
         AddColumnIfNotExists<UserGroupDto>(columns, NewColumnName);
 
         // We want specific keys for the default user groups, so we need to fetch the user groups again to set their keys.
-        IEnumerable<Guid> updatedUserGroups = Database.Fetch<UserGroupDto>()
-            .Select(x => x.Key = ResolveAliasToGuid(x.Alias));
-        Database.Update(updatedUserGroups);
+        List<UserGroupDto>? userGroups = Database.Fetch<UserGroupDto>();
+
+        foreach (UserGroupDto userGroup in userGroups)
+        {
+            userGroup.Key = ResolveAliasToGuid(userGroup.Alias);
+            Database.Update(userGroup);
+        }
 
         scope.Complete();
     }