### Body

Currently our telegram integration uses Telegram v13 telegram-bot library. On 1st of Jan 2023 a new, backwards incompatible version of Telegram-bot has been released : https://pypi.org/project/python-telegram-bot/20.0/#history and at least as reported by MyPy and our test suite test failures, Telegram 20 needs some changes to work:

Here is a transition guide that might be helpful. 

Transition guide is here: https://github.com/python-telegram-bot/python-telegram-bot/wiki/Transition-guide-to-Version-20.0

In the meantime we limit telegram to < 20.0.0

### Committer

- [X] I acknowledge that I am a maintainer/committer of the Apache Airflow project.
"""
        Returns the telegram bot client
        :return: telegram bot client
        """
        return telegram.bot.Bot(token=self.token)
    def __get_token(self, token: str | None, telegram_conn_id: str | None) -> str:
        """
        Returns the telegram API token
        :param token: telegram API token
        :param telegram_conn_id: telegram connection name
        :return: telegram API token
        """
        if token is not None:
            return token
        if telegram_conn_id is not None:
            conn = self.get_connection(telegram_conn_id)
            if not conn.password:
                raise AirflowException("Missing token(password) in Telegram connection")
            return conn.password
        raise AirflowException("Cannot get token: No valid Telegram connection supplied.")
    def __get_chat_id(self, chat_id: str | None, telegram_conn_id: str | None) -> str | None: