While trying to migrate from my current MWAA environment, I am taking my ideas from your repo from this folder example:
usecases/metadata-migration/2.2.2-2.4.3/export_data.py
Obviously I have adapted to our correspondent situation which is migrating from MWAA version 2.6.3 to 2.8.1, when deploying the DAG I am getting an issue for export_data_t, export_active_dags_t and export_variable_t with the following error message
ValueError: the bucket XXX does not exist, or is forbidden for access (ClientError('An error occurred (AccessDenied) when calling the CreateMultipartUpload operation: Access Denied'))