Update type hint for objective function to allow float return values

Author: anandvenugopal-tech

searches/hill_climbing.py

@@ -14,7 +14,7 @@ def __init__(
         x: int,
         y: int,
         step_size: int,
-        function_to_optimize: Callable[[int, int], int],
+        function_to_optimize: Callable[[int, int], int | float],
     ) -> None:
         """
         The constructor of the search problem.