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
'asana': asana,
    'celery': celery,
    'cloudant': cloudant,
    'cncf.kubernetes': kubernetes,
    'databricks': databricks,
    'datadog': datadog,
    'dingding': [],
    'discord': [],
    'docker': docker,
    'elasticsearch': elasticsearch,
    'exasol': exasol,
    'facebook': facebook,
    'ftp': [],
    'google': google,
    'grpc': grpc,
    'hashicorp': hashicorp,
    'http': http,
    'imap': [],
    'influxdb': influxdb,
    'jdbc': jdbc,
    'jenkins': jenkins,
    'jira': jira,
    'microsoft.azure': azure,
    'microsoft.mssql': mssql,
    'microsoft.psrp': psrp,
    'microsoft.winrm': winrm,
    'mongo': mongo,
    'mysql': mysql,
    'neo4j': neo4j,
    'odbc': odbc,