Re-instate device class update for binary sensors (#2743)

esphome/components/binary_sensor/__init__.py

@@ -49,6 +49,7 @@ from esphome.const import (
     DEVICE_CLASS_SMOKE,
     DEVICE_CLASS_SOUND,
     DEVICE_CLASS_TAMPER,
+    DEVICE_CLASS_UPDATE,
     DEVICE_CLASS_VIBRATION,
     DEVICE_CLASS_WINDOW,
 )
@@ -82,6 +83,7 @@ DEVICE_CLASSES = [
     DEVICE_CLASS_SMOKE,
     DEVICE_CLASS_SOUND,
     DEVICE_CLASS_TAMPER,
+    DEVICE_CLASS_UPDATE,
     DEVICE_CLASS_VIBRATION,
     DEVICE_CLASS_WINDOW,
 ]

esphome/const.py

@@ -863,6 +863,7 @@ DEVICE_CLASS_SAFETY = "safety"
 DEVICE_CLASS_SMOKE = "smoke"
 DEVICE_CLASS_SOUND = "sound"
 DEVICE_CLASS_TAMPER = "tamper"
+DEVICE_CLASS_UPDATE = "update"
 DEVICE_CLASS_VIBRATION = "vibration"
 DEVICE_CLASS_WINDOW = "window"
 # device classes of both binary_sensor and sensor component