Remove unused imports

Author: cclauss

data_structures/binary_tree/merge_two_binary_trees.py

@@ -7,8 +7,6 @@
 """
 from __future__ import annotations
 
-from typing import Optional
-
 
 class Node:
     """

data_structures/linked_list/skip_list.py

@@ -5,7 +5,7 @@
 from __future__ import annotations
 
 from random import random
-from typing import Generic, Optional, TypeVar, Union
+from typing import Generic, TypeVar
 
 KT = TypeVar("KT")
 VT = TypeVar("VT")