Removed unused imports

Author: vladvildanov

redis/cache.py

@@ -1,5 +1,3 @@
-import copy
-import weakref
 from abc import ABC, abstractmethod
 from collections import OrderedDict
 from enum import Enum

tests/test_connection.py

@@ -2,7 +2,6 @@
 import socket
 import threading
 import types
-import weakref
 from typing import Any
 from unittest import mock
 from unittest.mock import call, patch