Merge pull request #2518 from xtekky/newww

Fix missing NoneType in old python versions

g4f/providers/base_provider.py

@@ -7,7 +7,10 @@
 from abc import abstractmethod
 from inspect import signature, Parameter
 from typing import Optional, _GenericAlias
-from types import NoneType
+try:
+    from types import NoneType
+except ImportError:
+    NoneType = type(None)
 
 from ..typing import CreateResult, AsyncResult, Messages
 from .types import BaseProvider