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
"""
    Builds the name of provider package out of the package id provided/
    :param package_id: id of the package (like amazon or microsoft.azure)
    :return: full name of package in PyPI
    """
    package_suffix = package_id.replace(".", "-")
    return f"apache-airflow-providers-{package_suffix}"
def get_excluded_providers() -> List[str]:
    """
    Returns packages excluded for the current python version.
    Currently the only excluded provider is apache hive for Python 3.9.
    Until https://github.com/dropbox/PyHive/issues/380 is fixed.
    """
    return ['apache.hive'] if PY39 else []
def get_all_provider_packages() -> str:
    """Returns all provider packages configured in setup.py"""
    excluded_providers = get_excluded_providers()
    return " ".join(
        get_provider_package_from_package_id(package)
        for package in PROVIDERS_REQUIREMENTS
        if package not in excluded_providers
    )
class AirflowDistribution(Distribution):