Use new enums in sleepiq (#62203)

Co-authored-by: epenet <epenet@users.noreply.github.com>

homeassistant/components/sleepiq/binary_sensor.py

@@ -1,6 +1,6 @@
 """Support for SleepIQ sensors."""
 from homeassistant.components.binary_sensor import (
-    DEVICE_CLASS_OCCUPANCY,
+    BinarySensorDeviceClass,
     BinarySensorEntity,
 )
 
@@ -40,9 +40,9 @@ class IsInBedBinarySensor(SleepIQSensor, BinarySensorEntity):
         return self._state is True
 
     @property
-    def device_class(self):
+    def device_class(self) -> BinarySensorDeviceClass:
         """Return the class of this sensor."""
-        return DEVICE_CLASS_OCCUPANCY
+        return BinarySensorDeviceClass.OCCUPANCY
 
     def update(self):
         """Get the latest data from SleepIQ and updates the states."""