chore: update to real ghc 9.14

Author: guibou

flake.lock

@@ -2,7 +2,7 @@
   description = "PyF";
 
   inputs.flake-utils.url = "github:numtide/flake-utils";
-  inputs.nixpkgs.url = "github:guibou/nixpkgs/ghc-914";
+  inputs.nixpkgs.url = "github:nixos/nixpkgs";
   inputs.treefmt-nix.url = "github:numtide/treefmt-nix";
 
   nixConfig.extra-substituters = [ "https://guibou.cachix.org" ];