Use jazzy branch for realtime_tools (backport #104) (#105)

Author: mergify[bot]

kinematics_interface.jazzy.repos

@@ -7,7 +7,7 @@ repositories:
   realtime_tools:
     type: git
     url: https://github.com/ros-controls/realtime_tools.git
-    version: master
+    version: jazzy
   control_msgs:
     type: git
     url: https://github.com/ros-controls/control_msgs.git