channels: drop v2023 (and bullseye) as it reached its EOL

Apertis v2023 is no longer supported, see: https://www.apertis.org/release/v2023/v2023.7/releasenotes/

assigned to @daissi

changed title from Draft: channels: drop v2023 as it reached its EOL to Draft: channels: drop v2023 (and bullseye) as it reached its EOL

@wlozano fyi, I have prepared this MR (in anticipation of a potential OOM during the rebase), but as discussed it's still too early to merge it.

marked this merge request as ready

changed the description

requested review from @wlozano

Now it is the time to merge this!

merged