Sync the fedora.toml and users-groups.toml configs from upstream.
Change the zstd dependency to zstandard, following upstream 463bef3f
(Use different Python package for ZStandard, 2022-01-03).
Adjust python-magic dependency to file-magic. We already BR file-magic for
the test suite. This ensures we install what we tested and avoids the
problem of python3-file-magic conflicting and obsoleting python3-magic
without providing the same python-dist values¹.
¹ https://bugzilla.redhat.com/1899279
