Change return type of get_reference_ui_classes to list[str] for improved type hinting

Author: iMicknl

pyoverkiz/client.py

@@ -688,7 +688,7 @@ async def get_reference_timezones(self) -> JSON:
         return await self.__get("reference/timezones")
 
     @retry_on_auth_error
-    async def get_reference_ui_classes(self) -> JSON:
+    async def get_reference_ui_classes(self) -> list[str]:
         """Get a list of all defined UI classes."""
         return await self.__get("reference/ui/classes")