feat(diagnostic_graph_utils): remove unnecessary dependency in diagnostic_graph_utils (#9922)

Signed-off-by: vish0012 <vishalchhn42@gmail.com>

Author: vish0012

system/diagnostic_graph_utils/package.xml

@@ -14,7 +14,6 @@
   <depend>diagnostic_msgs</depend>
   <depend>rclcpp</depend>
   <depend>rclcpp_components</depend>
-  <depend>tier4_debug_msgs</depend>
   <depend>tier4_system_msgs</depend>
 
   <test_depend>ament_lint_auto</test_depend>