Hello,

Slack has released updates to its library and we can start using it for it. 

We especially like one change.

> slack_sdk has no required dependencies. This means aiohttp is no longer automatically resolved.

I've looked through the documentation and it doesn't look like a difficult task, but I think it's still worth testing.
More info: https://slack.dev/python-slack-sdk/v3-migration/index.html#from-slackclient-2-x

Best regards,
Kamil Breguła
setup.py
"""Finds requirements for an alias"""
    deprecated_extra = alias_to_look_for[0]
    new_extra = alias_to_look_for[1]
    if new_extra == '':  
        return []
    try:
        return EXTRAS_REQUIREMENTS[new_extra]
    except KeyError:  
        raise Exception(f"The extra {new_extra} is missing for alias {deprecated_extra}")
def add_extras_for_all_deprecated_aliases() -> None:
    """
    Add extras for all deprecated aliases. Requirements for those deprecated aliases are the same
    as the extras they are replaced with.
    The requirements are not copies - those are the same lists as for the new extras. This is intended.
    Thanks to that if the original extras are later extended with providers, aliases are extended as well.
    """
    for alias, extra in EXTRAS_DEPRECATED_ALIASES.items():
        requirements = EXTRAS_REQUIREMENTS.get(extra) if extra != '' else []
        if requirements is None:
            raise Exception(f"The extra {extra} is missing for deprecated alias {alias}")
        EXTRAS_REQUIREMENTS[alias] = requirements
add_extras_for_all_deprecated_aliases()
ALL_PROVIDERS = list(PROVIDERS_REQUIREMENTS.keys())
ALL_DB_PROVIDERS = [
    'apache.cassandra',
    'apache.druid',