build: remove unused argparse flake input

Author: Grazen0

flake.nix

@@ -5,8 +5,6 @@
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
     flake-parts.url = "github:hercules-ci/flake-parts";
     systems.url = "github:nix-systems/default";
-
-    argparse.url = "github:Grazen0/argparse";
   };
 
   outputs =