[bugfix] fix problem of installation

[Gaohan123]

PLEASE FILL IN THE PR DESCRIPTION HERE ENSURING ALL CHECKLIST ITEMS (AT THE BOTTOM) HAVE BEEN CONSIDERED.

Purpose

Fix the problem of installation, which can help other contributors

Test Plan

Follow the README.md in root dir.

Test Result

Processed prompts: 100%|███████████| 1/1 [00:11<00:00, 11.90s/it, est. speed input: 5.80 toks/s, output: 69.31 toks/s]
Adding requests: 100%|████████████████████████████████████████████████████████████████| 1/1 [00:00<00:00, 1348.65it/s]
Processed prompts: 100%|██████████| 1/1 [00:03<00:00,  3.08s/it, est. speed input: 267.91 toks/s, output: 0.00 toks/s]
Request ID: 0, Text Output: Well, it usually has input modules for data, processing units like neural networks or algorithms, output for generated audio, and scalability through parallel computing or distributed systems.If you want to know more about any part of this, feel free to ask.
Request ID: 0, Saved audio to output_audio/output_0.wav

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Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.
• (Optional) Release notes update. If your change is user facing, please update the release notes draft.

BEFORE SUBMITTING, PLEASE READ https://github.com/hsliuustc0106/vllm-omni/blob/main/CONTRIBUTING.md (anything written below this line will be removed by GitHub Actions)

[hsliuustc0106]

lgtm
approve