[neon-notifications] libaqbanking new version 6.2.9

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-focal_libaqbanking/78/display/redirect

#<Debian::UScan::DEHS::Package:0x0000555ddc0b3a80 @name="libaqbanking", @debian_uversion="6.2.6", @debian_mangled_uversion="6.2.6", @upstream_version="6.2.9", @upstream_url="https://www.aquamaniac.de/rdm/attachments/download/366/aqbanking-6.2.9.tar.gz", @status="Newer version available">