Dependencies missing in manifest

Describe the bug
Dependencies declared as required in cmake are missing in the manifest file.

To reproduce
I encountered this issue when trying to revive an old micro-ROS agent (foxy) installation on my ubuntu PC. Following this tutorial, I

1. Pulled the micro_ros_setup repo
2. Executed create_agent_ws
3. Executed build_agent
   ---- Up to here it is expected behavior, the agent is built properly.

When I then execute colcon build in my ROS 2 workspace, the build of the micro_ros_agent package fails as it is missing microxrcedds_agent. When I place the microxrcedds_agent repo in my workspace, it will still fail on the first colcon run, since microxrcedds_agent is not specified as dependency in the micro-ROS agent package manifest, so colcon doesn't know to build it first.

Expected behaviour
All ROS 2 packages in my workspace successfully build

System information (please complete the following information):
Ubuntu 20.04, ROS 2 foxy, latest foxy branch

Confronta le dipendenze dichiarate in micro_ros_agent/CMakeLists.txt alle righe 32-50 con quelle in micro_ros_agent/package.xml alle righe 18-22. Inizia leggendo entrambi i file, quindi esegui colcon build in un workspace ROS 2 contenente micro_ros_agent e microxrcedds_agent. Il lavoro è completato quando i pacchetti vengono compilati correttamente nell'ordine delle dipendenze.