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

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Author: pre-commit-ci[bot]

data_structures/arrays/monotonic_array.py

@@ -1,5 +1,6 @@
 import doctest
 
+
 # https://leetcode.com/problems/monotonic-array/
 def is_monotonic(nums: list[int]) -> bool:
     """