underscore msg_public_key since we aren't using it for now, will remo…

…ve later

signer/src/transaction_signer.rs

@@ -479,7 +479,7 @@ where
         &mut self,
         msg: &message::WstsMessage,
         bitcoin_chain_tip: &model::BitcoinBlockHash,
-        msg_public_key: PublicKey,
+        _msg_public_key: PublicKey,
         chain_tip_report: &MsgChainTipReport,
     ) -> Result<(), Error> {
         match &msg.inner {