From 12.x

apt update && apt full-upgrade -y

sudo sed -i 's/bookworm/trixie/g' /etc/apt/sources.list
sudo sed -i 's/bookworm/trixie/g' /etc/apt/sources.list.d/*

apt update
apt upgrade --without-new-pkgs -y
apt full-upgrade -y

apt --purge autoremove -y
apt autoclean
reboot