Update current_option typing

Author: bouwew

custom_components/plugwise/select.py

@@ -132,7 +132,7 @@ def __init__(
             self._location = location
 
     @property
-    def current_option(self) -> str:
+    def current_option(self) -> str| None:
         """Return the selected entity option to represent the entity state."""
         return self.device[self.entity_description.key]