Update README.md (#2962)

Author: fresh-little-lemon

docs/L1/XTuner/README.md

@@ -38,7 +38,6 @@ conda activate xtuner-env
 ```shell
 cd /root/Tutorial/docs/L1/XTuner
 pip install -r requirements.txt
-pip install torch==2.4.1 torchvision==0.19.1 torchaudio==2.4.1 --index-url https://download.pytorch.org/whl/cu121
 ```
 
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