[Bug] Bump SGLang version to 0.4.6.post4; Fix AsyncSGLangRollout #1482
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Checklist Before Starting
What does this PR do?
Similar to sgl-project/sglang#5997
High-Level Design
In the PP PR sgl-project/sglang#5724 broadcast_pyobj function changed its condition from judging rank==0 (if rank is local rank 0 of the passing ProcessGroup) to rank==src (if rank is global rank src), which breaks VerlEngine's broadcast logic when dp>1 and tp>1.
Additional Info.
Checklist Before Submitting
[BREAKING]
to the PR title if it breaks any API.