fix public API structure

Author: dirixmjm

plugwise_usb/network/registry.py

@@ -92,7 +92,7 @@ def cache_folder(self, cache_folder: str) -> None:
             self._network_cache.cache_root_directory = cache_folder
 
     @property
-    def registry(self) -> dict[int, tuple[str, NodeType | None]]:
+    def registry(self) -> list[str]:
         """Return dictionary with all joined nodes."""
         return deepcopy(self._registry)