[Misc] Upgrade vllm commit hash to 1215

[Potabk]

What this PR does / why we need it?

Upgrade vllm commit hash to 4429d934de3c5cc327b0d7aec8e473aeba38db90

Does this PR introduce any user-facing change?

How was this patch tested?

• vLLM version: v0.12.0
• vLLM main: vllm-project/vllm@ad32e3e

[gemini-code-assist]

Code Review

This pull request upgrades the vLLM commit hash and adapts the codebase to the changes in the new version. The changes primarily involve refactoring to align with upstream vLLM, such as replacing the custom InputBatch implementation with inheritance from the upstream class, and updating API calls with version checks for backward compatibility. One critical issue was found in an invalid type hint which would cause a syntax error.

[github-actions]

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[github-actions]

This pull request has conflicts, please resolve those before we can evaluate the pull request.