fix linting error

litellm/llms/custom_httpx/http_handler.py

@@ -1,7 +1,7 @@
 import asyncio
 import os
 import traceback
-from typing import Any, Mapping, Optional, Union
+from typing import TYPE_CHECKING, Any, Mapping, Optional, Union
 
 import httpx
 
@@ -9,6 +9,11 @@ import litellm
 
 from .types import httpxSpecialProvider
 
+if TYPE_CHECKING:
+    from litellm import LlmProviders
+else:
+    LlmProviders = Any
+
 try:
     from litellm._version import version
 except:
@@ -381,7 +386,7 @@ class HTTPHandler:
 
 
 def get_async_httpx_client(
-    llm_provider: Union[litellm.LlmProviders, httpxSpecialProvider],
+    llm_provider: Union[LlmProviders, httpxSpecialProvider],
     params: Optional[dict] = None,
 ) -> AsyncHTTPHandler:
     """