Build downstream humble version from humble branch (UniversalRobots#132)

Author: Felix Exner (fexner)

.github/workflows/industrial-ci.yml

@@ -61,7 +61,7 @@ jobs:
           - ROS_DISTRO: humble
             ROS_REPO: main
             IMMEDIATE_TEST_OUTPUT: true
-            DOWNSTREAM_WORKSPACE: "github:UniversalRobots/Universal_Robots_ROS2_Driver#main https://raw.githubusercontent.com/UniversalRobots/Universal_Robots_ROS2_Driver/main/Universal_Robots_ROS2_Driver-not-released.humble.repos"
+            DOWNSTREAM_WORKSPACE: "github:UniversalRobots/Universal_Robots_ROS2_Driver#humble https://raw.githubusercontent.com/UniversalRobots/Universal_Robots_ROS2_Driver/humble/Universal_Robots_ROS2_Driver-not-released.humble.repos"
             DOCKER_RUN_OPTS: --network ursim_net
             BEFORE_INIT: 'apt-get update -qq && apt-get install -y iproute2 iputils-ping && ip addr && ping -c5 192.168.56.101'
             URSIM_VERSION: '5.5.1'