Fix: Apply black formatting to remove_duplicates.py

Add blank lines after imports and before function definition to comply
with black code formatting style, which is checked by CI.

Co-Authored-By: Keon <[email protected]>

Author: devin-ai-integration[bot]

algorithms/arrays/remove_duplicates.py

@@ -10,8 +10,10 @@
 Time Complexity: O(n) for hashable items, O(n²) worst case for unhashable items
 Space Complexity: O(n) for the seen set and result array
 """
+
 from collections.abc import Hashable
 
+
 def remove_duplicates(array):
     seen = set()
     new_array = []