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
'pytest-instafail',
    'pytest-rerunfailures~=9.1',
    'pytest-timeouts',
    'pytest-xdist',
    'python-jose',
    'pywinrm',
    'qds-sdk>=1.9.6',
    'pytest-httpx',
    'requests_mock',
    'wheel',
    'yamllint',
]
devel_minreq = cgroups + devel + doc + kubernetes + mysql + pandas + password
devel_hadoop = devel_minreq + hdfs + hive + kerberos + presto + webhdfs
PROVIDERS_REQUIREMENTS: Dict[str, List[str]] = {
    'airbyte': http_provider,
    'alibaba': alibaba,
    'amazon': amazon,
    'apache.beam': apache_beam,
    'apache.cassandra': cassandra,
    'apache.drill': drill,
    'apache.druid': druid,
    'apache.hdfs': hdfs,
    'apache.hive': hive,
    'apache.kylin': kylin,
    'apache.livy': http_provider,
    'apache.pig': [],
    'apache.pinot': pinot,
    'apache.spark': spark,
    'apache.sqoop': [],