img2pdf: replace gitea src with github

  lib,

  pkgs,

  buildPythonPackage,

  fetchFromGitea,

  fetchFromGitHub,

  replaceVars,

  colord,

  setuptools,

  version = "0.6.1";

  pyproject = true;

  src = fetchFromGitea {

    domain = "gitlab.mister-muffin.de";

  # gitlab.mister-muffin.de produces a 500 error on 0.6.1

  # when upgrading, switch src attribute back to gitlab if fixed.

  src = fetchFromGitHub {

    owner = "josch";

    repo = "img2pdf";

    tag = version;