[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/persistent_segment_tree.py

@@ -36,7 +36,6 @@ def _build(self, arr: list[int], start: int, end: int) -> Node:
         right = self._build(arr, mid + 1, end)
         return Node(value=left.value + right.value, left=left, right=right)
 
-
     def update(self, version: int, index: int, value: int) -> int:
         """
         Updates the value at the given index and returns the new version.