attempt to fix dependabot docker version fix

[mikaelarguedas]

Apparently recursively finding Dockerfile is not working: https://github.com/dependabot/dependabot-core/issues/1015

Not sure why it stopped working, last successful Prs were from early 2022: https://github.com/osrf/docker_images/pull/594

[mikaelarguedas]

I'll merge this to see if this makes a change and will revert if no improvement is noticed.

It should open PRs to bump ubuntu jammy base image versions

[ruffsl]

Huh, that dependabot regression is annoying. Looks like things are moving finally:

• https://github.com/dependabot/dependabot-core/issues/2178#issuecomment-1979488388