discourse: fix update script after nix-universal-prefetch removal

#!/usr/bin/env nix-shell

#! nix-shell -i python3 -p bundix bundler nix-update nix-universal-prefetch "python3.withPackages (ps: with ps; [ requests click click-log packaging ])" prefetch-yarn-deps

#! nix-shell -i python3 -p bundix bundler nix-update nurl "python3.withPackages (ps: with ps; [ requests click click-log packaging ])" prefetch-yarn-deps

from __future__ import annotations

import click

        name = plugin.get('name')

        repo_name = plugin.get('repo_name') or name

        if fetcher == "fetchFromGitHub":

            url = f"https://github.com/{owner}/{repo_name}"

        else:

            raise NotImplementedError(f"Missing URL pattern for {fetcher}")

        repo = DiscourseRepo(owner=owner, repo=repo_name)

        # implement the plugin pinning algorithm laid out here:

        prev_hash = _nix_eval(f'discourse.plugins.{name}.src.outputHash')

        new_hash = subprocess.check_output([

            'nix-universal-prefetch', fetcher,

            '--owner', owner,

            '--repo', repo_name,

            '--rev', rev,

            "nurl",

            "--fetcher", fetcher,

            "--hash",

            url,

            rev,

        ], text=True).strip("\n")

        click.echo(f"Update {name}, {prev_commit_sha} -> {rev} in {filename}")