message: fix(statics): fix send many memo contract address for prod
  Changed send-many-memo contract address in the stx mainnet config
diff: @@ -399,7 +399,7 @@ class Stx extends Mainnet implements StacksNetwork {
  name = 'Stx';
  family = CoinFamily.STX;
  explorerUrl = 'https://explorer.stacks.co/';
  - sendmanymemoContractAddress = 'SP3HVG0704NNCN0DHYJ0SFHE87XPJWMVTXG4B30BD';
  + sendmanymemoContractAddress = 'SP3FBR2AGK5H9QBDH3EEN6DF8EK8JY7RX8QJ5SVTE';
  stakingContractAddress = 'SP000000000000000000002Q6VF78';
  }
  