Remove process_pending_orders call in Alpaca broker since it is only implemented in BacktestingBroker.

Author: hhhezhang

lumibot/brokers/alpaca.py

@@ -326,9 +326,6 @@ def _await_market_to_close(self, timedelta=None, strategy=None):
             The calling strategy; forwarded so pending orders can be processed
             the same way BacktestingBroker does.
         """
-        # First, handle any orders waiting to be processed.
-        self.process_pending_orders(strategy=strategy)
-
         # Seconds until the bell rings
         time_to_close = self.get_time_to_close()