Users need to change the nixgl flake url

[yoricksijsling]

When I upgraded my nixpkgs to nixos-23.11, I received the following error:

error: attribute 'vaapiIntel' missing

This error is actually already fixed, but after some research I found out that my nixgl flake input was stuck on an old version. It turns out that the repository has moved from guibou to nix-community, which I didn't know. The fix in my configuration was simple:

-    nixgl.url = "github:guibou/nixGL";
+    nixgl.url = "github:nix-community/nixGL";

I'm not sure if there's anything that can reasonably be done here. It's probably fine to immediately close it. I'm just hoping this issue shows up when users get these same symptoms and google for error: attribute 'vaapiIntel' missing.