rpmbuild: require the latest version of gem2rpm
    
    The old version
    
        [root@fedora ~]# rpm -qf /usr/bin/gem2rpm
        rubygem-gem2rpm-1.0.1-7.fc34.noarch
    
    Didn't work and failed with
    
        /usr/share/gems/gems/gem2rpm-1.0.1/bin/gem2rpm:55:in `initialize': No such file or directory @ rb_sysopen - https://rubygems.org/api/v1/gems/bioroebe.json (Errno::ENOENT)
                from /usr/share/gems/gems/gem2rpm-1.0.1/bin/gem2rpm:55:in `open'
                from /usr/share/gems/gems/gem2rpm-1.0.1/bin/gem2rpm:55:in `<top (required)>'
                from /usr/bin/gem2rpm:23:in `load'
                from /usr/bin/gem2rpm:23:in `<main>'