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What
Add
version_lt
attribute to inject dependency so that it is explicit that version 4 needs to be installed.Why
Inject 5+ is not compatible with Python 3.8 which is the default for Noetic/Focal.
This PR itself will not convince rosdep to install the correct version due to ros-infrastructure/rosdep#325 . However, at least it will be documented that version 5 is not compatible.