fix: Missed hash function invocation

Author: asimaranov

packages/sequencer/src/mempool/PendingTransaction.ts

@@ -139,7 +139,7 @@ export class PendingTransaction extends UnsignedTransaction {
 
   public toJSON(): PendingTransactionJSONType {
     return {
-      hash: this.hash.toString(),
+      hash: this.hash().toString(),
       methodId: this.methodId.toJSON(),
       nonce: this.nonce.toString(),
       sender: this.sender.toBase58(),