Flatpak: Outdated freedesktop platform being used

[Jackaed]

Describe the bug
Viper is currently using free desktop platform 21.08 on flatpak, which is EOL. Running flatpak update with viper installed causes a warning message to appear:

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.github._0negal.Viper

Info: runtime org.freedesktop.Platform.GL.default 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 extension:
   com.github._0negal.Viper

To Reproduce
Steps to reproduce the behavior:

1. Install viper from flathub
2. Run flatpak upgrade
3. See above warning messages

Version:
Viper: v1.10.0
Titanfall 2: v2.0.11.0

Northstar: v1.22.1
Node: v16.17.1
Electron: v22.3.25