Fixed ruff

Author: wrisa

instrumentation-genai/opentelemetry-instrumentation-langchain/src/opentelemetry/instrumentation/langchain/callback_handler.py

@@ -56,7 +56,7 @@ def on_chat_model_start(
     ) -> None:
         # Other providers/LLMs may be supported in the future and telemetry for them is skipped for now.
         if serialized.get("name") not in ("ChatOpenAI", "ChatBedrock"):
-              return
+            return
 
         if "invocation_params" in kwargs:
             params = (