add vllm to unit test dep

Author: DNXie

.github/workflows/unit_test.yaml

@@ -26,6 +26,8 @@ jobs:
           eval "$(ssh-agent -s)"
           ssh-add - <<< '${{ secrets.FORGE_GITHUB_CI_FOR_TORCHSTORE }}'
           python -m pip install git+ssh://[email protected]/meta-pytorch/torchstore.git
+      - name: Install vllm
+        run: python -m pip install vllm==0.10.1.1
       - name: Update pip
         run: python -m pip install --upgrade pip
       - name: Install pytorch