Remove sun entity description required fields mixin (#105848)

homeassistant/components/sun/sensor.py

@@ -26,19 +26,14 @@
 ENTITY_ID_SENSOR_FORMAT = SENSOR_DOMAIN + ".sun_{}"
 
 
-@dataclass(frozen=True)
-class SunEntityDescriptionMixin:
-    """Mixin for required Sun base description keys."""
+@dataclass(kw_only=True, frozen=True)
+class SunSensorEntityDescription(SensorEntityDescription):
+    """Describes a Sun sensor entity."""
 
     value_fn: Callable[[Sun], StateType | datetime]
     signal: str
 
 
-@dataclass(frozen=True)
-class SunSensorEntityDescription(SensorEntityDescription, SunEntityDescriptionMixin):
-    """Describes Sun sensor entity."""
-
-
 SENSOR_TYPES: tuple[SunSensorEntityDescription, ...] = (
     SunSensorEntityDescription(
         key="next_dawn",