diabonas's packager key: extend expiration, add signature by diabonas's new main key
requested to merge diabonas/archlinux-keyring:signature-diabonas-main-for-diabonas-packager into master
- The packager key currently expires on 2023-01-28, extend it by two years until 2024-06-29.
- Add a signature from my new main key, cf. #176 (closed).