[ci] chore: fix vllm_ascend ci

[wucong25]

What does this PR do?

fix vllm_ascend ci

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[gemini-code-assist]

Code Review

This pull request replaces the hardcoded torch.npu.empty_cache() call with a device-agnostic get_torch_device().empty_cache() call in hccl_checkpoint_engine.py to improve compatibility across different hardware backends. There are no review comments, so no additional feedback is provided.

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