@Ralf, do you have time to wait on higher version of locales package under PureOS, above 2.33-1? Probably not, probably maintaining Amber takes too much unnecessary time? You should try below proposal if you want, but please do not execute Yes if of any doubts (although this should not damage anything) and use apt install … (as described below) exclusively, as it is solely of your responsibility (not mine) to maintain your installed Linux distribution the way you need every piece of it:
Add: deb https://ftp.debian.org/debian/ bookworm main
sudo apt update
sudo apt install gcc-11-base locales libc-bin libc6 libstdc++6 libetonyek-0.1-1
Block/remove: bookworm main from your sources.list
sudo apt update
We’ve learned again something important from @amosbatto, thanks therefore!