Please consider upgrading to 22.08 or, better yet, 23.08.
This is the warning given by flatpak update
Info: runtime org.freedesktop.Platform branch 21.08 is end-of-life, with reason:
org.freedesktop.Platform 21.08 is no longer receiving fixes and security updates. Please update to a supported runtime version.
Info: applications using this runtime:
com.prusa3d.PrusaSlicer
Please consider upgrading to 22.08 or, better yet, 23.08.
This is the warning given by
flatpak update
Thanks!