[Flatpak] This app is using obsolete runtime. Please update to newer platform

```
Info: runtime org.gnome.Platform branch 43 is end-of-life, with reason:
   The GNOME 43 runtime is no longer supported as of September 20, 2023. Please ask your application developer to migrate to a supported platform.
Info: applications using this runtime:
   io.github.jhaygood86.mauborgne
```