core/txpool: allow future local transactions (ethereum#26930)

Local transactions should not be subject to the "future shouldn't churn pending txs" rule

core/txpool/txpool.go

@@ -736,7 +736,7 @@ func (pool *TxPool) add(tx *types.Transaction, local bool) (replaced bool, err e
 		}
 
 		// If the new transaction is a future transaction it should never churn pending transactions
-		if pool.isFuture(from, tx) {
+		if !isLocal && pool.isFuture(from, tx) {
 			var replacesPending bool
 			for _, dropTx := range drop {
 				dropSender, _ := types.Sender(pool.signer, dropTx)