chore(deps): bump torch from 2.9.1+cpu to 2.12.0+cpu in /backend/python/vllm in the pip group across 1 directory #6196

Job	Run time
generate-matrix	9s
backend-jobs-singlearch (linux/amd64, auto, -cpu-vllm, ubuntu-latest, ubuntu:24.04, true, vllm, .... / backend-build	3m 43s
backend-jobs-singlearch (hipblas, linux/amd64, auto, -gpu-rocm-hipblas-vllm, ubuntu-latest, rocm/... / backend-build	3m 53s
backend-jobs-singlearch (l4t, 13, 0, linux/arm64, auto, -nvidia-l4t-cuda-13-arm64-vllm, ubuntu-24... / backend-build	3m 53s
backend-jobs-singlearch (intel, linux/amd64, auto, -gpu-intel-vllm, ubuntu-latest, intel/oneapi-b... / backend-build	3m 53s
backend-jobs-singlearch (cublas, 13, 0, linux/amd64, auto, -gpu-nvidia-cuda-13-vllm, ubuntu-lates... / backend-build	2m 21s
backend-jobs-singlearch (cublas, 12, 8, linux/amd64, auto, -gpu-nvidia-cuda-12-vllm, ubuntu-lates... / backend-build	3m 53s
backend-jobs-darwin	0s
backend-jobs-multiarch	-1s
backend-merge-jobs-multiarch	-1s
backend-merge-jobs-singlearch	0s
	21m 43s

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