Remove support for python <3.11 (#1273)

Python 3.11 ships with latest Debian Bookworm. 
pypy is not that widely used with this library based on statistics. It could be added back when pypy supports python 3.11.

kasa/transports/klaptransport.py

@@ -51,7 +51,8 @@ import secrets
 import struct
 import time
 from asyncio import Future
-from typing import TYPE_CHECKING, Any, Generator, cast
+from collections.abc import Generator
+from typing import TYPE_CHECKING, Any, cast
 
 from cryptography.hazmat.primitives import padding
 from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes