Use new enums in netgear (#61943)

homeassistant/components/netgear/sensor.py

@@ -1,6 +1,6 @@
 """Support for Netgear routers."""
 from homeassistant.components.sensor import (
-    DEVICE_CLASS_SIGNAL_STRENGTH,
+    SensorDeviceClass,
     SensorEntity,
     SensorEntityDescription,
 )
@@ -25,7 +25,7 @@ SENSOR_TYPES = {
         key="signal",
         name="signal strength",
         native_unit_of_measurement=PERCENTAGE,
-        device_class=DEVICE_CLASS_SIGNAL_STRENGTH,
+        device_class=SensorDeviceClass.SIGNAL_STRENGTH,
     ),
     "ssid": SensorEntityDescription(
         key="ssid",