update to 2.3.0 (rhbz#2088759)
    
    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