Memory leak in InactivityMonitor in irc.py

[KeyszerS]

A change in Python at version 3.7.4 introduced a leak for any thread that doesn't get it's "join" method called.
See https://bugs.python.org/issue43050
See also https://bugs.python.org/issue37788

Here is fixed function:

    def _clear_timers(self):
        """Cancel scheduled execution of the timers."""
        for timer in [self._timer_ping, self._timer_abort]:
            if timer is not None:
                timer.cancel()
                timer.join()

[boreq]

As far as I can see those bugs were fixed already which probably means that a fix is no longer necessary. Can you confirm that?