Log Message:
finance/ruby-braintree: update to 3.4.0

3.4.0 (2021-04-12)

* Add local_payment_reversed webhook notification
* Add Transaction.adjust_authorization method to support for multiple
  authorizations for a single transaction
* Add merchant_account_id parameter to Transaction#refund
* Add store_id and store_ids parameters to Transaction#search
* Add support for ActiveSupport::TimeWithZone when generating XML (thanks
  @Tonkpils!)