v1: fix MultiprocExecutor.collective_rpc() return type

Suggestion by @tlrmchlsmth.

Signed-off-by: Mark McLoughlin <[email protected]>

Author: markmc

vllm/v1/executor/multiproc_executor.py

@@ -104,7 +104,7 @@ def collective_rpc(self,
                        method: str,
                        timeout: Optional[float] = None,
                        args: Tuple = (),
-                       kwargs: Optional[Dict] = None) -> Any:
+                       kwargs: Optional[Dict] = None) -> List[Any]:
         """
         Execute an RPC call on workers.