Specify overriding for EE::Project#execute_hooks

Signed-off-by: Rémy Coutable <remy@rymai.me>

ee/app/models/ee/project.rb

@@ -459,6 +459,7 @@ module EE
       end
     end
 
+    override :execute_hooks
     def execute_hooks(data, hooks_scope = :push_hooks)
       super