fix type annotation for owners

reflex_ipad/pages/medicine.py

@@ -70,8 +70,8 @@ class NewMedicineState(rx.State):
             async with self:
                 self.load_last_scan()
 
-    @rx.var
-    def owners(self):
+    @rx.cached_var
+    def owners(self) -> List[str]:
         with rx.session() as session:
             statement = select(Owner)
             results = session.exec(statement)