Update requirements.txt

requirements.txt

-transformers>=4.34.0
+transformers==4.39.0
 wandb==0.15.3
 torch==2.0.1
 sentencepiece==0.1.99
 tokenizers==0.13.3
-accelerate==0.21.0
+accelerate==0.30.1
 bitsandbytes==0.40.0
 vllm
 fraction