[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/heap/skew_heap.py

@@ -1,4 +1,3 @@
-
 from __future__ import annotations
 
 from collections.abc import Iterable, Iterator
@@ -85,6 +84,7 @@ def merge(
 
         return result
 
+
 class SkewHeap[T]:
     """
     A data structure that allows inserting a new value and to pop the smallest