Update CI (#249)

Author: Acuadros95

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ on:
 jobs:
     rmw_microxrcedds_ci:
         runs-on: ubuntu-20.04
-        container: microros/micro-ros-agent:rolling
+        container: microros/micro-ros-agent:humble
 
         steps:
         - uses: actions/checkout@v2
@@ -23,8 +23,8 @@ jobs:
           run: |
             git clone -b ros2 https://github.com/eProsima/Micro-CDR src/Micro-CDR
             git clone -b ros2 https://github.com/eProsima/Micro-XRCE-DDS-Client src/Micro-XRCE-DDS-Client
-            git clone -b main https://github.com/micro-ROS/rosidl_typesupport_microxrcedds src/rosidl_typesupport_microxrcedds
-            git clone -b master https://github.com/ros2/rmw src/rmw
+            git clone -b humble https://github.com/micro-ROS/rosidl_typesupport_microxrcedds src/rosidl_typesupport_microxrcedds
+            git clone -b humble https://github.com/ros2/rmw src/rmw
             touch src/rosidl_typesupport_microxrcedds/test/COLCON_IGNORE
             # Install coverage tools
             apt update && apt install -y python3-pip