fix(autoware_detection_by_tracker): fix cppcheck warning of functionS…

…tatic (#8257)

fix: deal with functionStatic warnings

Signed-off-by: taisa1 <kento.osa@tier4.jp>
Co-authored-by: Yi-Hsiang Fang (Vivid) <146902905+vividf@users.noreply.github.com>

perception/autoware_detection_by_tracker/src/debugger/debugger.hpp

@@ -104,7 +104,7 @@ class Debugger
   std::unique_ptr<autoware::universe_utils::StopWatch<std::chrono::milliseconds>> stop_watch_ptr_;
   std::unique_ptr<autoware::universe_utils::DebugPublisher> processing_time_publisher_;
 
-  autoware_perception_msgs::msg::DetectedObjects removeFeature(
+  static autoware_perception_msgs::msg::DetectedObjects removeFeature(
     const tier4_perception_msgs::msg::DetectedObjectsWithFeature & input)
   {
     autoware_perception_msgs::msg::DetectedObjects objects;