Woo! Noob question, but I've been using the debian apt repo for a while now, is there anything I need to do to use the stable repo, or does that happen as a side effect of the bookworm becoming stable?
You need to update your apt sources file. Here is the process. Run the following commands as root. Use sudo -s first to avoid having to prefix every command with sudo. This assumes you are running bullseye. If not you need to update to bullseye first.
Update your current installation first: apt udpate apt full-upgrade -y
Then upgrade: sed -i 's/bullseye/bookworm/g' /etc/apt/sources.list export LC_ALL=C apt update apt upgrade --without-new-pkgs -y apt full-upgrade -y