fix vllm transformer version bug

README.md

@@ -180,7 +180,7 @@ Notice that `vllm==v0.9.0` has a lot of specific requirements, for example `torc
 ``` sh
 conda create -n cosyvoice_vllm --clone cosyvoice
 conda activate cosyvoice_vllm
-pip install vllm==v0.9.0 -i https://mirrors.aliyun.com/pypi/simple/ --trusted-host=mirrors.aliyun.com
+pip install vllm==v0.9.0 transformers==4.51.3 -i https://mirrors.aliyun.com/pypi/simple/ --trusted-host=mirrors.aliyun.com
 python vllm_example.py
 ```