Currently the version information is [hardcoded](https://gitlab.archlinux.org/archlinux/arch-release-promotion/-/blob/6c94d150db338aaef12469c965523ee7a6dc63ad/arch_release_promotion/__init__.py), but we want to set it only via the pyproject.toml (until poetry supports git tags: https://github.com/python-poetry/poetry/issues/3670).