Flatpak (www.flathub.org) version is outdated

[38github]

The Flatpak (www.flathub.org) version is outdated and the current provided one is:

Updated
August 12, 2022

Version
3_9_0nightly1

[hoffie]

Hrm, to be honest, I don't think FlatHub is part of any official release process. I think we once built Flatpaks as part of Github CI. Flathub submission seems to have been done by @joao-p-marques in the past (#803).

@joao-p-marques Is that still true? Could you update it? Should we maybe ping you explicitly when releasing new versions?

[joao-p-marques]

Hi! Sorry for the late response. Yes, it is true.

The flathub version is a bit old because of the error that flathub/io.jamulus.Jamulus#174 tries to fix.

However, it seems that it does need some updates... Help wanted 😃