Update Flatpak Runtime to 7.1

[danirabbit]

@meisenzahl I hadn't marked it ready for review yet because I was waiting to see if the CI would complete or not ;)

[meisenzahl]

@danirabbit ah sorry. I supposed it was ready because you already requested a review. Than I will slow down a bit with the other reviews 😀

[danirabbit]

@meisenzahl ah my bad, I didn't think it would notify since it was marked as draft. I'll make sure not to do that!