docs: update deploy.mdx to use node 20、pnpm 8

[cl1107]

Summary

使用现有的配置，github action在运行时会有很多warning，因此进行更新

Related Issue

Checklist

• [ ] Tests updated (or not required).
• [ ] Documentation updated (or not required).

[CLAassistant]

All committers have signed the CLA.

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[chenjiahan]

Thanks! ❤️