KTailctl v0.19.1

Fixes the flatpak version crashing after a few seconds and updates a dependency.

Changes

• Remove the native Ubuntu builds from CI to focus on flatpak and nix as the main distribution methods

Fixes

• Fixes incorrect name of the DBus service
• Provides flatpak access to the DBus service

Chores

• Update kirigami-addons: v1.6.0 -> v1.7.0