[neon-notifications] Dev Required: flatpak - 1.10.3

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-focal_flatpak/47/display/redirect

#<Debian::UScan::DEHS::Package:0x0000564fd2822f30 @name="flatpak", @debian_uversion="1.10.2", @debian_mangled_uversion="1.10.2", @upstream_version="1.10.3", @upstream_url="https://github.com/flatpak/flatpak/releases/download/1.10.3/flatpak-1.10.3.tar.xz", @status="Newer version available">