chore(deps): bump torch from 2.7.0 to 2.7.1+xpu in /backend/python/vllm in the pip group across 1 directory (#8360)

chore(deps): bump torch

Bumps the pip group with 1 update in the /backend/python/vllm directory: torch.


Updates `torch` from 2.7.0 to 2.7.1+xpu

---
updated-dependencies:
- dependency-name: torch
  dependency-version: 2.7.1+xpu
  dependency-type: direct:production
  dependency-group: pip
...

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