Set tag of 'microxrcedds_agent'

Signed-off-by: David Laseca Perez <davidlaseca@eprosima.com>

Author: David-LP99

micro_ros_agent/cmake/SuperBuild.cmake

@@ -26,7 +26,7 @@ if(NOT microxrcedds_agent_FOUND)
             GIT_REPOSITORY
                 https://github.com/eProsima/Micro-XRCE-DDS-Agent.git
             GIT_TAG
-                develop
+                v3.0.2
             PREFIX
                 ${PROJECT_BINARY_DIR}/agent
             INSTALL_DIR