[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

data_structures/binary_tree/maximum_sum_bst.py

@@ -44,7 +44,7 @@ def max_sum_bst(root: TreeNode) -> int:
     """
     ans: int = 0
 
-    def solver(node: 'TreeNode' | None) -> tuple[bool, int, int, int]:
+    def solver(node: "TreeNode" | None) -> tuple[bool, int, int, int]:
         """
         Returns the maximum sum by making recursive calls
         >>> t1 = TreeNode(1)