CI: ros2 branch fails for Humble source build

[henningkayser]

Cause is a header include that is not available with MoveIt 2 Humble: https://github.com/PickNikRobotics/moveit_task_constructor/actions/runs/6221140714/job/16882537563#step:4:211

[sjahr]

I guess this is caused by the Pipeline planner refactoring PR being merged in our version of ros2.