Draft: Pull-in latest glib/gtk4

I know these are still odd versioning, and therefore considered unstable. However, we are very close to the end of GNOME's development cycle, and these can be considered more like Beta/RC releases, with the API freeze already in place. I am updating them here because we will 100% get the "stable" releases before the next alpine's release, and both @Newbyte and me don't have much time for the next GNOME cycle, so we want to start testing things early.

I understand if this is rejected, but at least building and being able to test in multiple devices should help catch issues earlier.