message: chore(utxo-lib): default to VERSION4_BRANCH_NU5 for zcashTest
  According to the testnet activation was
  at block (Oct 6, 2021)
  Issue:
diff: import { TxOutput } from 'bitcoinjs-lib';
  -import { networks, Network, getMainnet } from '../networks';
  +import { networks, Network, getMainnet, isMainnet } from '../networks';
  import { UtxoTransaction } from './UtxoTransaction';
  import { UtxoTransactionBuilder } from './UtxoTransactionBuilder';
  @@ -43,7 +43,7 @@ export function getDefaultTransactionVersion(network: Network): number {
  case networks.bitcoingold:
  return 2;
  case networks.zcash:
  - return ZcashTransaction.VERSION4_BRANCH_CANOPY;
  + return isMainnet(network) ? ZcashTransaction.VERSION4_BRANCH_CANOPY : ZcashTransaction.VERSION4_BRANCH_NU5;
  default:
  return 1;
  }
  