[CPU] Missing ray for CPU backend

[DamonFool]

This patch fixes the follow bug for CPU backend.

INFO 11-05 08:54:08 importing.py:15] Triton not installed or not compatible; certain GPU-related functions will not be available.
Traceback (most recent call last):
  File "/usr/lib/python3.10/runpy.py", line 196, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/lib/python3.10/runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "/usr/local/lib/python3.10/dist-packages/vllm/entrypoints/openai/api_server.py", line 30, in <module>
    from vllm.engine.multiprocessing.engine import run_mp_engine
  File "/usr/local/lib/python3.10/dist-packages/vllm/engine/multiprocessing/engine.py", line 8, in <module>
    from ray.exceptions import RayTaskError
ModuleNotFoundError: No module named 'ray'

Please review it.
Thanks.

[github-actions]

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[Isotr0py]

@DamonFool Can you check if #10021 has fixed this?

[DamonFool]

@DamonFool Can you check if #10021 has fixed this?

Okay.
This bug seems to be fixed after that.

Thanks for taking a look at this.
So just close this pr.