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
airflow/providers/slack/hooks/slack.py
self,
        token: Optional[str] = None,
        slack_conn_id: Optional[str] = None,
        **client_args: Any,
    ) -> None:
        super().__init__()
        self.token = self.__get_token(token, slack_conn_id)
        self.client = WebClient(self.token, **client_args)
    def __get_token(self, token: Any, slack_conn_id: Any) -> str: