Master will start braking soon (#180)

Use foxy branch of ros2_control_demos.

Author: destogl

Universal_Robots_ROS2_Driver.repos

@@ -10,7 +10,7 @@ repositories:
   ros2_control_demos:
     type: git
     url: https://github.com/ros-controls/ros2_control_demos.git
-    version: master
+    version: foxy
   ros2_controllers:
     type: git
     url: https://github.com/ros-controls/ros2_controllers.git