More lingering dependencies on kf5 in testing

[Shmerl <shtetldik+shmerl@gmail.com>]

Looks like newer konqueror is stuck in unstable, due to qt6-webengine-dev having

only limited architecture support. I suppose konqueror itself needs to be aligned

with qt6-webengine-dev architectures list to get it unstuck, which will remove

the need for a bunch of lingering kf5 packages in testing

https://tracker.debian.org/pkg/konqueror

Another one that still remains is kup-backup, but that would need to be

updated to newer version and rebuilt against Kf 6 / Qt 6.

Regards,

Shmerl.