Try to always decode RPM data instead of working with bytes
    
    Since Fedora 31, those are unicode strings, but before they are bytes
    There is dummy .decode() method provided for backwards compatibility,
    but everything else stopped working. By always decoding first,
    we try to minimize the problem.
    
    In the future (when RPM is updated everywhere), the decode calls
    shall be removed.
    
    See https://pagure.io/FedoraReview/issue/356
    See https://bugzilla.redhat.com/show_bug.cgi?id=1693751