test(bedrock): accept the router kwarg in the knowledge base search fake

tests/logging_callback_tests/test_bedrock_knowledgebase_hook.py

@@ -333,6 +333,7 @@ async def test_bedrock_kb_request_body_has_transformed_filters(
         timeout=None,
         client=None,
         _is_async=False,
+        router=None,
     ):
         litellm_params_dict = (
             litellm_params.model_dump(exclude_none=False)