micro_ros_agent installation issue on ROS 2 Humble Ubuntu 22.04

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## Issue template

- Hardware description: PC, Ubuntu 22.04
- RTOS: Ardupilot SITL
- Installation type: micro_ros_setup
- Version or commit hash: humble

#### Steps to reproduce the issue

Follow [First micro-ROS Application on Linux](https://micro.ros.org/docs/tutorials/core/first_application_linux/). When creating and building the micro-ROS agent

```
ros2 run micro_ros_setup create_agent_ws.sh
ros2 run micro_ros_setup build_agent.sh
```
I run into the following error:
```
stderr: micro_ros_agent
CMake Error at /opt/ros/humble/share/fastrtps/cmake/fastrtps-dynamic-targets.cmake:37 (message):
Some (but not all) targets in this export set were already defined.

Targets Defined: eProsima_atomic

Targets not yet defined: fastrtps

Call Stack (most recent call first):
/opt/ros/humble/share/fastrtps/cmake/fastrtps-config.cmake:60 (include)
CMakeLists.txt:37 (find_package)
```

#### Expected behavior

micro-ROS agent installation works as expected and I can use it for working with Ardupilot.

#### Actual behavior

```
stderr: micro_ros_agent
CMake Error at /opt/ros/humble/share/fastrtps/cmake/fastrtps-dynamic-targets.cmake:37 (message):
Some (but not all) targets in this export set were already defined.

Targets Defined: eProsima_atomic

Targets not yet defined: fastrtps

Call Stack (most recent call first):
/opt/ros/humble/share/fastrtps/cmake/fastrtps-config.cmake:60 (include)
CMakeLists.txt:37 (find_package)
```

#### Additional information

Installing Fast-DDS from source didn't fix the issue for me either

Riproduci il malfunzionamento con create_agent_ws.sh e build_agent.sh su Ubuntu 22.04 con ROS 2 Humble. Ispeziona CMakeLists.txt in corrispondenza della chiamata a find_package e la configurazione CMake di fastrtps a cui si fa riferimento, usando come punto di partenza le definizioni dei target riportate. Il lavoro è completato quando lo spazio di lavoro dell’agente micro-ROS viene compilato correttamente e l’agente può essere eseguito.

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