Fix trixie custom package repository
The custom package repository for Trixie was set to Debian 12 (bookworm), set it properly to Debian 13 (trixie) now that the packages are built for that suite.
The custom package repository for Trixie was set to Debian 12 (bookworm), set it properly to Debian 13 (trixie) now that the packages are built for that suite.