fix: python < 3.10 compat

Author: Rafiot

valkey/__init__.py

@@ -1,4 +1,5 @@
 from importlib import metadata
+from typing import Tuple, Union
 
 from valkey import asyncio  # noqa
 from valkey.backoff import default_backoff
@@ -45,7 +46,7 @@ def int_or_str(value):
 
 
 __version__: str
-VERSION: tuple[int | str, ...]
+VERSION: Tuple[Union[int | str], ...]
 
 try:
     __version__ = metadata.version("valkey")