testing/gamescope: upgrade to 3.14.23
https://github.com/ValveSoftware/gamescope/compare/3.12.0...3.14.23
I took some inspiration (and patches) from Chimera Linux.
https://github.com/ValveSoftware/gamescope/compare/3.12.0...3.14.23
I took some inspiration (and patches) from Chimera Linux.