kimik2.5-fp4-gb200-dynamo-vllm: bump vLLM image to v0.21.0 #1582

Bugbot Review

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Final Result: Bugbot completed review and found 1 potential issue.

Request ID: serverGenReqId_e51f11b2-a29d-4c0a-a52e-093d86066694

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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