add a dependency (partial backport #305)

[mergify]

This is an automatic backport of pull request #305 done by Mergify.

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[christophfroehlich]

Needs ros-controls/ros2_control#1052 to be merged first

[christophfroehlich]

@Mergifyio rebase

[mergify]

rebase

❌ Base branch update has failed

Git reported the following error:

Rebasing (1/1)
Auto-merging example_1/bringup/launch/rrbot.launch.py
Auto-merging example_2/bringup/launch/diffbot.launch.py
CONFLICT (modify/delete): example_3/bringup/launch/rrbot_base.launch.py deleted in HEAD and modified in 484d2cc (add a dependency; fix deprecation warning (#305)).  Version 484d2cc (add a dependency; fix deprecation warning (#305)) of example_3/bringup/launch/rrbot_base.launch.py left in tree.
CONFLICT (modify/delete): example_4/bringup/launch/rrbot_base.launch.py deleted in HEAD and modified in 484d2cc (add a dependency; fix deprecation warning (#305)).  Version 484d2cc (add a dependency; fix deprecation warning (#305)) of example_4/bringup/launch/rrbot_base.launch.py left in tree.
CONFLICT (modify/delete): example_5/bringup/launch/rrbot_base.launch.py deleted in HEAD and modified in 484d2cc (add a dependency; fix deprecation warning (#305)).  Version 484d2cc (add a dependency; fix deprecation warning (#305)) of example_5/bringup/launch/rrbot_base.launch.py left in tree.
CONFLICT (modify/delete): example_6/bringup/launch/rrbot_base.launch.py deleted in HEAD and modified in 484d2cc (add a dependency; fix deprecation warning (#305)).  Version 484d2cc (add a dependency; fix deprecation warning (#305)) of example_6/bringup/launch/rrbot_base.launch.py left in tree.
CONFLICT (modify/delete): example_8/bringup/launch/rrbot_base.launch.py deleted in HEAD and modified in 484d2cc (add a dependency; fix deprecation warning (#305)).  Version 484d2cc (add a dependency; fix deprecation warning (#305)) of example_8/bringup/launch/rrbot_base.launch.py left in tree.
error: could not apply 484d2cc... add a dependency; fix deprecation warning (#305)
hint: Resolve all conflicts manually, mark them as resolved with
hint: "git add/rm <conflicted_files>", then run "git rebase --continue".
hint: You can instead skip this commit: run "git rebase --skip".
hint: To abort and get back to the state before "git rebase", run "git rebase --abort".
Could not apply 484d2cc... add a dependency; fix deprecation warning (#305)

err-code: 1A8CD