stylix: point nixpkgs input to more conventional nixos-unstable ref

[trueNAHO]

Update the nixpkgs ref, following the conversation from:

Keep in mind that the Nixpkgs PR has to land into nixpkgs-unstable (https://nixpk.gs/pr-tracker.html?pr=368404) because that is what we are tracking:

stylix/flake.nix

Line 45 in 963e77a

nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

The package PR has landed onto nixpkgs-unstable, but we gotta wait for the HM merge. I guess they wait for nixos-unstable:

https://github.com/nix-community/home-manager/blob/10e99c43cdf4a0713b4e81d90691d22c6a58bdf2/flake.nix#L4

Is there a reason why nixos-unstable isn't tracked in stylix?

-- arunoruto, "ghostty: init"

[danth]

Makes sense to track the same branch as Home Manager.