Some checks, that are not allways running, are marked as mandatory

[maxhbr]

The following Checks are marked and they either need to be dropped or ran always

[armintaenzertng]

I found out that the problem was actually an upgrade of ubuntu-latest to Ubuntu 24.04 on the side of GitHub Actions. The new Ubuntu version doesn't support Python 3.7 anymore. I fixed the Ubuntu version to 22.04, which should work for the next two years according to this statement.

[armintaenzertng]

@maxhbr, could you please replace all required checks of the style

Install and Test /install_and_test (ubuntu-latest, ...) and Run Linter / check_code_style (ubuntu-latest, ...)
with
Install and Test /install_and_test (ubuntu-22.04, ...) and Run Linter / check_code_style (ubuntu-22.04, ...)