.github/workflows/test.yml: Use Ubuntu 22.04
The packaging situation of firefox-geckodriver on Ubuntu 20.04 is a mess and leads to broken packages:
The following packages have unmet dependencies: firefox-geckodriver : Depends: firefox (= 116.0.2+build1-0ubuntu0.20.04.1) but 116.0.3+build1-0ubuntu0.20.04.1~mt1 is to be installed E: Unable to correct problems, you have held broken packages.
Therefore, use Ubuntu 22.04 where the firefox package includes the selenium driver so no more version mismatch.