📦 Update flatpak to Gnome runtime 44

[Ferenc-]

Licensing

• I confirm that this is either my code or was released under the terms of a GPLv3-or-later compatible license. Also I agree to release it here under the terms of the GPLv3-or-later.

Description

Updates the flatpak package runtime to the latest Gnome runtime, which is 44 at the moment.

[Schmiddiii]

Thanks. Note that this will only update the development-Flatpak, to update the Flathub-Flatpak you will need an equivalent PR here.