perf(trl): set a timeout on vllm client HTTP calls

[tejasae-afk]

Add a timeout to HTTP requests in trl/generation/vllm_client.py to prevent indefinite hangs.

Reason: Network calls without a timeout can hang a worker indefinitely.

Validation: /Users/tejasattarde/Desktop/gh-patchbot/.venv/bin/python -m py_compile trl/generation/vllm_client.py.

Context: py-http-timeout at trl/generation/vllm_client.py:184.

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Note

Low Risk
Low risk: only adds a fixed timeout to two requests.get calls to prevent indefinite hangs, without changing request payloads or response handling logic.

Overview
Adds a 10s timeout to vLLM client HTTP health-check and world-size GET requests in trl/generation/vllm_client.py, preventing workers from hanging indefinitely when the server is unreachable or unresponsive.

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