Update go-sendxmpp to version 0.8.4 / rev 13 via SR 1156683
    
    https://build.opensuse.org/request/show/1156683
    by user jubalh + anag+factory
    - Update to 0.8.4:
      * Properly handle lost connection.
      * Better compatibility with perl sendxmpp config files.
      * Improve file name for private Ox keys.
      * Improve fallback behavior if no SRV records are provided.
      * Remove 100ms sleep before closing the connection. This should
        be no more needed since go-xmpp commit
        9684a8ff690f0d75e284f8845696c5057926d276.
      * Return an error if there is no answer to an IQ within 60s.
      * Check for errors after sending the auth message during
        SCRAM authentication (via go-xmpp v0.1.2).