Update CMakeLists.txt (#247) (#263)

(cherry picked from commit 52abdf5)

Co-authored-by: Rafal Gorecki <126687345+rafal-gorecki@users.noreply.github.com>

Author: mergify[bot]

micro_ros_agent/CMakeLists.txt

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-cmake_minimum_required(VERSION 3.5)
+cmake_minimum_required(VERSION 3.11)
 
 option(UROSAGENT_GENERATE_PROFILE
   "Generates agent.refs according to the .msgs provided in the .repos" OFF