message: feat(rpc): fix expected error message in integration test
  The error is renamed in
diff: @@ -44,7 +44,7 @@ impl ValidSince {
  // Failed to send transaction since SinceImmaturity
  for _ in 1..relative {
  - assert_send_transaction_fail(node, &transaction, "Transaction: Immature");
  + assert_send_transaction_fail(node, &transaction, "TransactionFailedToVerify: Immature");
  node.generate_block();
  }
  @@ -69,7 +69,7 @@ impl ValidSince {
  // Failed to send transaction since SinceImmaturity
  let tip_number = node.rpc_client().get_tip_block_number();
  for _ in tip_number + 1..absolute {
  - assert_send_transaction_fail(node, &transaction, "Transaction: Immature");
  + assert_send_transaction_fail(node, &transaction, "TransactionFailedToVerify: Immature");
  node.generate_block();
  }
  @@ -113,7 +113,7 @@ impl ValidSince {
  {
  let since = since_from_relative_timestamp(median_time_seconds + 1);
  let transaction = node.new_transaction_with_since(cellbase.hash(), since);
  - assert_send_transaction_fail(node, &transaction, "Transaction: Immature");
  + assert_send_transaction_fail(node, &transaction, "TransactionFailedToVerify: Immature");
  }
  {
  let since = since_from_relative_timestamp(median_time_seconds - 1);
  @@ -155,7 +155,7 @@ impl ValidSince {
  {
  let since = since_from_absolute_timestamp(median_time_seconds + 1);
  let transaction = node.new_transaction_with_since(cellbase.hash(), since);
  - assert_send_transaction_fail(node, &transaction, "Transaction: Immature");
  + assert_send_transaction_fail(node, &transaction, "TransactionFailedToVerify: Immature");
  }
  {
  let since = since_from_absolute_timestamp(median_time_seconds - 1);
  @@ -182,7 +182,7 @@ impl ValidSince {
  (0..relative_blocks - DEFAULT_TX_PROPOSAL_WINDOW.0).for_each(|i| {
  info!("Tx is Immature in block N + {}", i);
  - assert_send_transaction_fail(node, &tx, "Transaction: Immature");
  + assert_send_transaction_fail(node, &tx, "TransactionFailedToVerify: Immature");
  node.generate_block();
  });
  