ssh provider has limit to sshtunnel  < 0.2
https://github.com/apache/airflow/blob/9d6ae609b60449bd274c2f96e72486d73ad2b8f9/setup.py#L451

I don't know why? sshtunnel  already released 0.4
I didn't open PR because I don't know this provider i just tried to install it and couldn't due to conflicts with other requirements in my system so eventually i used vitrual env to solve my problem but logging this issue so that someone who knows this code can handle it.
setup.py
'openfaas': [],
    'opsgenie': http_provider,
    'oracle': oracle,
    'pagerduty': pagerduty,
    'papermill': papermill,
    'plexus': plexus,
    'postgres': postgres,
    'presto': presto,
    'qubole': qubole,
    'redis': redis,
    'salesforce': salesforce,
    'samba': samba,
    'segment': segment,
    'sendgrid': sendgrid,
    'sftp': ssh,
    'singularity': singularity,
    'slack': slack,
    'snowflake': snowflake,
    'sqlite': [],
    'ssh': ssh,
    'tableau': tableau,
    'telegram': telegram,
    'trino': trino,
    'vertica': vertica,
    'yandex': yandex,
    'zendesk': zendesk,
}
ADDITIONAL_EXTRAS_REQUIREMENTS: Dict[str, List[str]] = {
    'apache.atlas': atlas,
    'apache.webhdfs': webhdfs,