fix pylint

Author: cyx-6

python/mlc_llm/bench/dataset.py

@@ -285,7 +285,9 @@ def _process_data(self, data):
         return {
             "prompt": [
                 {
-                    "content": f"You are a helpful assistant that answers in JSON. Here's the json schema you must adhere to:\n<schema>\n{new_schema}\n</schema>\n",
+                    "content": "You are a helpful assistant that answers in JSON. "
+                    "Here's the json schema you must adhere to:"
+                    f"\n<schema>\n{new_schema}\n</schema>\n",
                     "role": "system",
                 },
                 data["prompt"][1],