[neon-notifications] Dev Required: libaqbanking - 6.4.3beta

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-focal_libaqbanking/164/display/redirect

#<Debian::UScan::DEHS::Package:0x00005620d7724518 @name="libaqbanking", @debian_uversion="6.4.1", @debian_mangled_uversion="6.4.1", @upstream_version="6.4.3beta", @upstream_url="https://www.aquamaniac.de/rdm/attachments/download/413/aqbanking-6.4.3beta.tar.gz", @status="Newer version available", @warnings="Nothing was downloaded before, skipping pgp check">