perf: use unwrap and save 198 cycles (#17836)

Author: malik672

crates/transaction-pool/src/pool/parked.rs

@@ -189,7 +189,7 @@ impl<T: ParkedOrd> ParkedPool<T> {
         while !self.last_sender_submission.is_empty() && limit.is_exceeded(self.len(), self.size())
         {
             // NOTE: This will not panic due to `!last_sender_transaction.is_empty()`
-            let sender_id = self.last_sender_submission.last().expect("not empty").sender_id;
+            let sender_id = self.last_sender_submission.last().unwrap().sender_id;
             let list = self.get_txs_by_sender(sender_id);
 
             // Drop transactions from this sender until the pool is under limits