goofy ass pdm backend error

flake.nix

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let pkgs = import nixpkgs { inherit system; }; in {
        devShell = pkgs.mkShell {
          buildInputs = with pkgs; [
            (python3.withPackages (ps: [
              (ps.amaranth.overridePythonAttrs (old: {
                src = fetchFromGitHub {
                  owner = "prjunnamed";
                  repo = "amaranth";
                  rev = "main";
                  hash = "sha256-LRe+FwwrbmdaJcR24LBkcv6XSMKeku0aAlEQSDLYJJ8=";
                };}))]))
          ];
        };
      }
    );
}