Pin Navigation2 demo to humble-2024.10.0 (#197)

The current dockerfile of the navigation2 demo depends on space-ros:latest.
This may prevent the image from building if we release a new version of Space
ROS but we have not yet adapted the Navigation 2 demo as needed, breaking the
build.

This commit pins the version of the Navigation 2 demo to the latest version of
Space ROS that we have tested it with (humble-2024.10.0).

navigation2/Dockerfile

@@ -20,7 +20,7 @@
 #   VERSION         - The version of Space ROS (default: "preview")
 #   SPACE_ROS_IMAGE - The base Space ROS image to build on
 
-ARG SPACE_ROS_IMAGE=osrf/space-ros:latest
+ARG SPACE_ROS_IMAGE=osrf/space-ros:humble-2024.10.0
 
 FROM ${SPACE_ROS_IMAGE}