setup_chat_template still used in chapter 11 of the LLM course

[qheaden]

In Chapter 11.3 of the Huggingface LLM course, the code snippet to start fine-tuning the model uses the setup_chat_template function which is deprecated and removed from newer versions of the trl library.

I have created a pull request with proposed changes updating that snippet to use clone_chat_template instead.

Here is the PR link. I would love a review on it. This fix will keep learners from having to track down what the replacement function is. #1167