Correct type hint

[gshtras]

No description provided.

[github-actions]

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[mawong-amd]

Let's change this in upstream rather than doing this separate PR. Unless there's a functionality improvement.

[mawong-amd]

Approve as this PR fixes and enables the use of Cython, which was broken as detailed here.

[mawong-amd]

The incorrect type hint originated from vllm-project#7049