Merge branch 'pkgs-argument' into 'master'

flake-parts: use pkgs argument

See merge request !48

flake.nix

@@ -37,10 +37,9 @@
         imports = [
           inputs.horizon-hoogle.flakeModule
         ];
-        perSystem = { config, system, ... }:
+        perSystem = { pkgs, config, system, ... }:
           let
             pkgs-libR = import nixpkgs-libR { inherit system; };
-            pkgs = import nixpkgs { inherit system; };
             crypto = inputs.iohk-nix.overlays.crypto;
             iohk-pkgs = import nixpkgs { inherit system; overlays = [ crypto ]; };
           in