Switch to using the rosdep liboctomap-dev key.

That is, instead of taking this dependency from the
ROS distribution, take it from the system.  This is
to ensure that we use a consistent ABI with the
platform-provided liboctomap.

Note that in the near future, we'll be removing the
ROS-provided octomap in favor of only using the
system-provided one.

Signed-off-by: Chris Lalancette <[email protected]>

package.xml

@@ -16,7 +16,7 @@
 
   <buildtool_depend>ament_cmake_auto</buildtool_depend>
 
-  <depend>octomap</depend>
+  <depend>liboctomap-dev</depend>
   <depend>octomap_msgs</depend>
   <depend>sensor_msgs</depend>
   <depend>tf2</depend>