[neon-notifications] libaqbanking new version 6.2.6

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-focal_libaqbanking/71/display/redirect

#<Debian::UScan::DEHS::Package:0x0000560ffa7900a8 @name="libaqbanking", @debian_uversion="6.0.2", @debian_mangled_uversion="6.0.2", @upstream_version="6.2.6", @upstream_url="https://www.aquamaniac.de/rdm/attachments/download/354/aqbanking-6.2.6.tar.gz", @status="Newer version available">