[Feature] Upgrade Torch version to 2.9

[Fridge003]

Checklist

• 1. If the issue you raised is not a feature but a question, please raise a discussion at https://github.com/sgl-project/sglang/discussions/new/choose Otherwise, it will be closed.
• 2. Please use English, otherwise it will be closed.

Motivation

#11992

After upgrading to torch 2.9, the torch dependency of cu13.0 and cu12.9 can also be unified.

Ref: https://pytorch.org/blog/pytorch-2-9/

Related resources

No response

[FlamingoPg]

I see, I will try that

[Fridge003]

Close by #12969