chore: Upgrade default image

[JonasProgrammer]

Ubuntu 18.04 is not supported anymore, but still the default image chosen by the driver.

In an upcoming major release, this should be addressed in a breaking change.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

Oh I should have looked into the issues first before opening #106.

There seems to be more to do than just what I proposed?