Use new method name

ee/app/controllers/projects/security/dependencies_controller.rb

@@ -40,7 +40,7 @@ module Projects
       end
 
       def pipeline
-        @pipeline ||= project.all_pipelines.latest_successful_for(project.default_branch)
+        @pipeline ||= project.all_pipelines.latest_successful_for_ref(project.default_branch)
       end
 
       def query_params

ee/lib/api/dependencies.rb

@@ -4,7 +4,7 @@ module API
   class Dependencies < Grape::API
     helpers do
       def dependencies_by(params)
-        pipeline = user_project.all_pipelines.latest_successful_for(user_project.default_branch)
+        pipeline = user_project.all_pipelines.latest_successful_for_ref(user_project.default_branch)
 
         return [] unless pipeline