refactor(obstacle_stop_planner): update package xml

Signed-off-by: beyza <bnk@leodrive.ai>

Author: beyza

planning/obstacle_stop_planner/package.xml

@@ -10,6 +10,7 @@
   <maintainer email="tomoya.kimura@tier4.jp">Tomoya Kimura</maintainer>
   <maintainer email="shumpei.wakabayashi@tier4.jp">Shumpei Wakabayashi</maintainer>
   <maintainer email="berkay@leodrive.ai">Berkay Karaman</maintainer>
+  <maintainer email="bnk@leodrive.ai">Beyza Nur Kaya</maintainer>
 
   <license>Apache License 2.0</license>