Cancel the update subscription for the historical bars.

        Args:
            bars: The bar list that was obtained from ``reqHistoricalData``
                with a keepUpToDate subscription.

def cancelHistoricalData(self, bars: BarDataList):
        """
        Cancel the update subscription for the historical bars.

        Args:
            bars: The bar list that was obtained from ``reqHistoricalData``
                with a keepUpToDate subscription.

        """
        self.client.cancelHistoricalData(bars.reqId)
        self.wrapper.endSubscription(bars)