Add Debian 11 and 12 to supported OS

[Valantin]

Pull Request (PR) description

Add Debian 11 and 12 to supported OS

This Pull Request (PR) fixes the following issues

[TheMeier]

please remove 7,8,9... and maybe even 10?

[Valantin]

My point is, remove all deprecated version in one PR, before that adding new version for all supported OS
I isn't the correct way, I do it all in one

@bastelfreak I probably misunderstood the suggested method?

[bastelfreak]

Adding support for a new OS, is an enhancement. Removing support is a backwards-incompatible change. And sometime we fix broken stuff, then it is a bug(fix). We use labels on or PRs to separate those three changes and try not to mix it. We've some more infos on https://voxpupuli.org/docs/reviewing_pr/.

Each label will be added to a different section of the CHANGELOG.md. Because of that we shouldn't mix it. And it makes potential rebases/cherry-picks and reverts easier if bugfixes/enhancements/backwards-incompatible changes easier.

I also think Debian 7,8,9,10 should be dropped, but in another PR.