Ok, so I looked at the issues page on github, I installed the flatpak version, it managed to launch but it crashed every time I tried to update all subscriptions as described in this post so I downgraded to the previous flatpak version using this command :
sudo flatpak update --commit=836528e95772b20779e658ffbab641b7b052140b7dd1ebaa90cde8d5bc5929a4 net.sourceforge.liferea
and it works again. Thanks for the help @flyingcakes