chore(map_loader): add maintainer (#6232)

Signed-off-by: Yamato Ando <yamato.ando@tier4.jp>

Author: YamatoAndo

map/map_loader/package.xml

@@ -5,6 +5,7 @@
   <version>0.1.0</version>
   <description>The map_loader package</description>
   <maintainer email="ryohsuke.mitsudome@tier4.jp">Ryohsuke Mitsudome</maintainer>
+  <maintainer email="yamato.ando@tier4.jp">Yamato Ando</maintainer>
   <maintainer email="ryu.yamamoto@tier4.jp">Ryu Yamamoto</maintainer>
   <maintainer email="koji.minoda@tier4.jp">Koji Minoda</maintainer>
   <maintainer email="masahiro.sakamoto@tier4.jp">Masahiro Sakamoto</maintainer>