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
}
CORE_EXTRAS_REQUIREMENTS: Dict[str, List[str]] = {
    'async': async_packages,
    'celery': celery,  
    'cgroups': cgroups,
    'cncf.kubernetes': kubernetes,  
    'dask': dask,
    'deprecated_api': deprecated_api,
    'github_enterprise': flask_appbuilder_authlib,
    'google_auth': flask_appbuilder_authlib,
    'kerberos': kerberos,
    'ldap': ldap,
    'leveldb': leveldb,
    'pandas': pandas,
    'password': password,
    'rabbitmq': rabbitmq,
    'sentry': sentry,
    'statsd': statsd,
    'virtualenv': virtualenv,
}
EXTRAS_REQUIREMENTS: Dict[str, List[str]] = deepcopy(CORE_EXTRAS_REQUIREMENTS)
def add_extras_for_all_providers() -> None:
    """
    Adds extras for all providers.
    By default all providers have the same extra name as provider id, for example
    'apache.hive' extra has 'apache.hive' provider requirement.
    """
    for provider_name, provider_requirement in PROVIDERS_REQUIREMENTS.items():
        EXTRAS_REQUIREMENTS[provider_name] = provider_requirement
def add_additional_extras() -> None: