Fix ruff formatting issues

Author: Shreya

sorts/insertion_sort.py

@@ -14,6 +14,7 @@
 """
 
 from __future__ import annotations
+
 from collections.abc import MutableSequence
 from typing import Any, Protocol, TypeVar
 

sorts/pancake_sort.py

@@ -9,6 +9,7 @@
 """
 
 from __future__ import annotations
+
 from collections.abc import MutableSequence
 
 
@@ -41,5 +42,4 @@ def pancake_sort(arr: MutableSequence[int]) -> MutableSequence[int]:
 
 if __name__ == "__main__":
     import doctest
-
     doctest.testmod()