test(anthropic): import Final for the annotated locals

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

tests/test_litellm/llms/anthropic/chat/test_anthropic_chat_handler.py

@@ -1,6 +1,7 @@
 import json
 import threading
 from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
+from typing import Final
 from unittest.mock import AsyncMock, MagicMock, patch
 
 import httpx