add Perl requires to git-email
    
    Resolves: rhbz#2020487
    
    In git version 2.33.0, git-send-email.perl has optimized modules
    loading[1]. This resulted in perl.req not detecting requires properly,
    because it doesn't detect requires that are not at the start of new line.
    This commit adds explicit Requires into the spec file.
    
    [1]https://github.com/git/git/commit/f4dc9432fd287bde9100488943baf3c6a04d90d1