Remove authenticated log

This pollutes the log a lot and doesn't help debugging.
All cases where a packet is not authenticated should already be
logged in different places, so just remove this.

quinn-proto/src/connection/mod.rs

@@ -1380,7 +1380,6 @@ where
             Some(x) => x,
             None => return,
         };
-        trace!("authenticated");
         if self.side.is_server() {
             if self.spaces[SpaceId::Initial].crypto.is_some() && space_id == SpaceId::Handshake {
                 // A server stops sending and processing Initial packets when it receives its first Handshake packet.