[neon-notifications] Dev Required: flatpak - 1.12.5

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-focal_flatpak/153/display/redirect

#<Debian::UScan::DEHS::Package:0x000055b4bb1f8e28 @name="flatpak", @debian_uversion="1.12.4", @debian_mangled_uversion="1.12.4", @upstream_version="1.12.5", @upstream_url="https://github.com/flatpak/flatpak/releases/download/1.12.5/flatpak-1.12.5.tar.xz", @status="Newer version available">