perf: Upgrade vLLM version to 0.6.3.post1

[kthui]

What does the PR do?

Upgrade vLLM version to 0.6.3.post1

Checklist

• PR title reflects the change and is of format <commit_type>: <Title>
• Changes are described in the pull request.
• Related issues are referenced.
• Populated github labels field
• Added test plan and verified test passes.
• Verified that the PR passes existing CI.
• Verified copyright is correct on all changed files.
• Added succinct git squash message before merging ref.
• All template sections are filled out.
• Optional: Additional screenshots for behavior/output changes with before/after.

Commit Type:

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• build
• ci
• docs
• feat
• fix
• perf
• refactor
• revert
• style
• test

Related PRs:

triton-inference-server/vllm_backend#76

Where should the reviewer start?

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Test plan:

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• CI Pipeline ID: See the related PR.

Caveats:

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Background

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Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)

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