tokio-xmpp: Update to the new jid crate

This helps a bit thanks to fewer clones, but otherwise there are very
few changes.

tokio-xmpp/src/stream_start.rs

@@ -16,7 +16,7 @@ pub async fn start<S: AsyncRead + AsyncWrite + Unpin>(
     ns: String,
 ) -> Result<XMPPStream<S>, Error> {
     let attrs = [
-        ("to".to_owned(), jid.clone().domain()),
+        ("to".to_owned(), jid.domain().to_owned()),
         ("version".to_owned(), "1.0".to_owned()),
         ("xmlns".to_owned(), ns.clone()),
         ("xmlns:stream".to_owned(), ns::STREAM.to_owned()),