Half the relayer timeout on v3 (#3508)

### Description

V3 counterpart of
https://github.com/hyperlane-xyz/hyperlane-monorepo/pull/3431

Co-authored-by: nambrot <nambrot@googlemail.com>

rust/chains/hyperlane-ethereum/src/tx.rs

@@ -51,7 +51,7 @@ where
 
     info!(?to, %data, ?tx_hash, "Dispatched tx");
 
-    match tokio::time::timeout(Duration::from_secs(300), dispatched).await {
+    match tokio::time::timeout(Duration::from_secs(150), dispatched).await {
         // all good
         Ok(Ok(Some(receipt))) => {
             info!(?tx_hash, "confirmed transaction");