Trigger merge request hook when source updated

app/services/merge_requests/refresh_service.rb

@@ -51,7 +51,7 @@ module MergeRequests
 
         if merge_request.source_branch == @branch_name || force_push?
           merge_request.reload_code
-          merge_request.mark_as_unchecked
+          update_merge_request(merge_request)
         else
           mr_commit_ids = merge_request.commits.map(&:id)
           push_commit_ids = @commits.map(&:id)
@@ -59,14 +59,20 @@ module MergeRequests
 
           if matches.any?
             merge_request.reload_code
-            merge_request.mark_as_unchecked
+            update_merge_request(merge_request)
           else
-            merge_request.mark_as_unchecked
+            update_merge_request(merge_request)
           end
         end
       end
     end
 
+    def update_merge_request(merge_request)
+      MergeRequests::UpdateService.new(
+        merge_request.target_project,
+        @current_user, merge_status: 'unchecked').execute(merge_request)
+    end
+
     # Add comment about pushing new commits to merge requests
     def comment_mr_with_commits
       merge_requests = @project.origin_merge_requests.opened.where(source_branch: @branch_name).to_a