Fix: fix typo in OpenAI error logging message (#8865)

### What problem does this PR solve?

Correct the logging message from "OpenAI cat_with_tools" to "OpenAI
chat_with_tools" in the `_exceptions` method of the `Base` class to
accurately reflect the method name and improve error traceability.

### Type of change

- [x] Typo

rag/llm/chat_model.py

         return ans + LENGTH_NOTIFICATION_EN
 
     def _exceptions(self, e, attempt):
-        logging.exception("OpenAI cat_with_tools")
+        logging.exception("OpenAI chat_with_tools")
         # Classify the error
         error_code = self._classify_error(e)