[rollout] fix: Add "non_block" argument compatibility to collective_rpc() (volcengine#3934)

### What does this PR do?

This PR fixes a `TypeError` that occurs when newer versions of vLLM
(v0.11+) attempt to call
`ExternalZeroMQDistributedExecutor.collective_rpc`.

The issue stems from a recent vLLM update
(vllm-project/vllm#24219) that added the keyword
argument `non_block` to the `Executor.collective_rpc` interface. Since
the `verl` implementation of `collective_rpc` did not define this
parameter, calling it with `non_block=True` resulted in the error:
`TypeError: ExternalZeroMQDistributedExecutor.collective_rpc() got an
unexpected keyword argument 'non_block'`.

By using `**extra_kwargs` in the function signature, we ensure
compatibility with both legacy and modern vLLM interfaces without
affecting the existing ZeroMQ non-blocking logic.

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---------

Co-authored-by: weikaiwen <[email protected]>

Author: chenjiaoAngel

verl/workers/rollout/vllm_rollout/vllm_async_server.py

@@ -95,6 +95,7 @@ def collective_rpc(
         timeout: Optional[float] = None,
         args: tuple = (),
         kwargs: Optional[dict[str, Any]] = None,
+        **extra_kwargs,
     ) -> list[Any]:
         if isinstance(method, str):
             sent_method = method