[deps][LLM] Upgrade vLLM to 0.15.0#60253

nrghosh wants to merge 20 commits into

ray-project:masterray-project/ray:masterfrom

nrghosh:nrghosh/vllm-0.14.0-rcnrghosh/ray:nrghosh/vllm-0.14.0-rcCopy head branch name to clipboard