fixes detection of property dependencies for classes inheriting from other observables

Inheriting from a class that itself has defined properties, you cannot get those properties by calling
vars(type(obj)). Instead, you have to go through all the classes' members and check if they are properties.
You can either do this using dir(type(obj)) and get the members using getattr or just use inspect.getmembers.

src/pydase/observer_pattern/observer/property_observer.py

@@ -49,7 +49,7 @@ class PropertyObserver(Observer):
     def _process_observable_properties(
         self, obj: Observable, deps: dict[str, Any], prefix: str
     ) -> None:
-        for k, value in vars(type(obj)).items():
+        for k, value in inspect.getmembers(type(obj)):
             prefix = (
                 f"{prefix}." if prefix != "" and not prefix.endswith(".") else prefix
             )