Use new enums in supla (#62406)

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

homeassistant/components/supla/cover.py

@@ -2,11 +2,7 @@
 import logging
 from pprint import pformat
 
-from homeassistant.components.cover import (
-    ATTR_POSITION,
-    DEVICE_CLASS_GARAGE,
-    CoverEntity,
-)
+from homeassistant.components.cover import ATTR_POSITION, CoverDeviceClass, CoverEntity
 
 from . import DOMAIN, SUPLA_COORDINATORS, SUPLA_SERVERS, SuplaChannel
 
@@ -115,4 +111,4 @@ class SuplaGateDoor(SuplaChannel, CoverEntity):
     @property
     def device_class(self):
         """Return the class of this device, from component DEVICE_CLASSES."""
-        return DEVICE_CLASS_GARAGE
+        return CoverDeviceClass.GARAGE