Deprecate raw_value attribute in onewire entity (#135171)

* Drop raw_value attribute in onewire entity

* Deprecate only

homeassistant/components/onewire/entity.py

@@ -54,6 +54,7 @@ def extra_state_attributes(self) -> dict[str, Any] | None:
         """Return the state attributes of the entity."""
         return {
             "device_file": self._device_file,
+            # raw_value attribute is deprecated and can be removed in 2025.8
             "raw_value": self._value_raw,
         }