Use upstream fork

Author: christophfroehlich

ros2_controllers.rolling.repos

@@ -5,8 +5,8 @@ repositories:
     version: master
   realtime_tools:
     type: git
-    url: https://github.com/ros-controls/realtime_tools.git
-    version: master
+    url: https://github.com/pal-robotics-forks/realtime_tools.git
+    version: boost/lockfree/realtime/buffer
   control_msgs:
     type: git
     url: https://github.com/ros-controls/control_msgs.git