python3Packages.wagtail: fix missing static files (#463483)

{

  lib,

  buildPythonPackage,

  fetchFromGitHub,

  fetchPypi,

  # build-system

  setuptools,

  version = "7.2";

  pyproject = true;

  src = fetchFromGitHub {

    owner = "wagtail";

    repo = "wagtail";

    tag = "v${version}";

    hash = "sha256-o/4jn32ffR3BPVNwtFKJ6PowXYi7SpjBqghdeZIl5tM=";

  # The GitHub source requires some assets to be compiled, which in turn

  # requires fixing the upstream package lock. We need to use the PyPI release

  # until https://github.com/wagtail/wagtail/pull/13136 gets merged.

  src = fetchPypi {

    inherit pname version;

    hash = "sha256-ijnfkIvWSrAp4IvxkfR19UzJFPhKpB6a55tBv0HVXsM=";

  };

  build-system = [