fix: import pymysql.cursors always

Author: soulee-dev

pymysqlreplication/tests/base.py

@@ -3,7 +3,7 @@
 import copy
 import os
 import sys
-import typing
+from pymysql.cursors import Cursor
 import pymysql
 
 from pymysqlreplication import BinLogStreamReader
@@ -13,9 +13,6 @@
 else:
     import unittest
 
-if typing.TYPE_CHECKING:
-    from pymysql.cursors import Cursor
-
 base = unittest.TestCase