Remove nixpkgs crane input

It seems this no longer exists

Signed-off-by: Lee Smet <lee.smet@hotmail.com>

Author: LeeSmet

flake.nix

@@ -3,7 +3,6 @@
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
 
     crane.url = "github:ipetkov/crane";
-    crane.inputs.nixpkgs.follows = "nixpkgs";
 
     flake-compat.url = "https://flakehub.com/f/edolstra/flake-compat/1.tar.gz";