Simplify abstract classes

Author: Cjkjvfnby

data_structures/hashing/hash_map.py

@@ -32,7 +32,7 @@ def __bool__(self):
 _deleted = _DeletedItem()
 
 
-class HashMap(MutableMapping, Generic[KEY, VAL]):
+class HashMap(MutableMapping[KEY, VAL]):
     """
     Hash map with open addressing.
     """