[vllm hash update] update the pinned vllm hash (#194476)

This PR is auto-generated nightly by [this action](https://github.com/pytorch/pytorch/blob/main/.github/workflows/nightly.yml).
Update the pinned vllm hash.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/194476
Approved by: https://github.com/pytorchbot