chore: update license of pointcloud preprocessor (#9397)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: wep21

sensing/autoware_pointcloud_preprocessor/package.xml

@@ -15,6 +15,8 @@
   <maintainer email="david.wong@tier4.jp">David Wong</maintainer>
   <maintainer email="melike@leodrive.ai">Melike Tanrikulu</maintainer>
   <license>Apache License 2.0</license>
+  <!-- For polygon_remover, vector_map_filter -->
+  <license>LGPLv3</license>
 
   <!-- Original authors -->
   <author>Open Perception</author>