Use transformers from release instead of the `main` branch (#343)

requirements.txt

@@ -7,6 +7,6 @@ black[jupyter]
 datasets
 fire
 git+https://github.com/huggingface/peft.git
-git+https://github.com/huggingface/transformers.git
+transformers>=4.28.0
 sentencepiece
 gradio