fix: Add missing import for PermissionDeniedError

Co-authored-by: aider (gpt-5.2-codex) <aider@aider.chat>

tests/basic/test_exceptions.py

@@ -45,9 +45,10 @@ def test_get_ex_info():
 def test_permission_denied_error():
     """Test specific handling of PermissionDeniedError"""
     ex = LiteLLMExceptions()
-    from litellm import PermissionDeniedError
     from types import SimpleNamespace
 
+    from litellm import PermissionDeniedError
+
     response = SimpleNamespace(status_code=403, text="")
     perm_error = PermissionDeniedError(
         message="Permission denied",