feat(auth.py): add logging when clearing device key to improve tracea…

…bility

src/otf_api/auth.py

@@ -61,6 +61,7 @@ def device_key(self) -> str | None:
     @device_key.setter
     def device_key(self, value: str | None):
         if not value:
+            logger.info("Clearing device key")
             self._device_key = value
             return