[Humble] Bump ros-tooling/action-ros-ci from 0.3 to 0.4

[mergify]

Backport of #356 to Humble.

[mergify]

Cherry-pick of f0b4cf4 has failed:

On branch mergify/bp/humble/pr-356
Your branch is up to date with 'origin/humble'.

You are currently cherry-picking commit f0b4cf4.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   .github/workflows/ci.yml

no changes added to commit (use "git add" and/or "git commit -a")

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