refactor(sorts): remove redundant TypeVar in pancake_sort (#15503)

Author: iosayin

sorts/pancake_sort.py

@@ -21,16 +21,13 @@
 """
 
 from collections.abc import Sequence
-from typing import Any, Protocol, TypeVar
+from typing import Any, Protocol
 
 
 class Comparable(Protocol):
     def __lt__(self, other: Any, /) -> bool: ...
 
 
-T = TypeVar("T", bound=Comparable)
-
-
 def pancake_sort[T: Comparable](arr: Sequence[T]) -> list[T]:
     """Sort Array with Pancake Sort.