Broken DAG: No module name 'airflow.providers'

Hi!

The import apache-airflow[all] is not supported, which will block the subsequent import of apache-airflow-backport-providers-amazon. The line boto3==1.14.44 is not required as boto3 is included by default. As such, if you just use a requirements.txt with the single line

apache-airflow-backport-providers-amazon

then you should be all set.

Thanks!

Thanks!