chore(pointcloud_preprocessor): add maintainer (#6442)

add kyoichi sugahara as code owner

Signed-off-by: kyoichi-sugahara <kyoichi.sugahara@tier4.jp>

Author: kyoichi-sugahara

sensing/pointcloud_preprocessor/package.xml

@@ -7,6 +7,7 @@
   <maintainer email="abrahammonrroy@yahoo.com">amc-nu</maintainer>
   <maintainer email="yukihiro.saito@tier4.jp">Yukihiro Saito</maintainer>
   <maintainer email="shunsuke.miura@tier4.jp">Shunsuke Miura</maintainer>
+  <maintainer email="kyoichi.sugahara@tier4.jp">Kyoichi Sugahara</maintainer>
   <license>Apache License 2.0</license>
 
   <!-- Original authors -->