fix the deepseekcoder template to avoid repeat problem

[relic-yuexi]

What does this PR do?

I fixed the template for DeepSeek-Coder. The reference link for the template is as follows:

https://github.com/deepseek-ai/DeepSeek-Coder/blob/b7ba565956fe61153064f288862daf1896de5393/finetune/finetune_deepseekcoder.py#L16

The main change was the addition of the "<|EOT|>" token, which ensures that the trained model does not generate infinitely due to the lack of an end-of-sequence marker. I have trained the relevant models and compared them, finding that the new version of the template perfectly solves the problem.

Before submitting

• Did you read the contributor guideline?
• Did you write any new necessary tests?

[hiyouga]

Nice catch