style: sort standard imports by type and alphabet

Author: 2298321623-bot

graphs/a_star.py

@@ -11,12 +11,12 @@
 Space Complexity: O(V) to store the graph structures and priority queue.
 """
 
+
 from __future__ import annotations
 
-from collections.abc import Callable
 import heapq
 import math
-
+from collections.abc import Callable
 
 
 # ==========================================