Added full support of `Bot API 7.7 <https://core.telegram.org/bots/api-changelog#july-7-2024>`_

- Added the class :class:`aiogram.types.refunded_payment.RefundedPayment`,
  containing information about a refunded payment.
- Added the field :code:`refunded_payment` to the class
  :class:`aiogram.types.message.Message`,
  describing a service message about a refunded payment.