[Bugfix][Async] fix update_async_output_token_ids for async + spec#30122

izhuhaoran wants to merge 2 commits intovllm-project:mainvllm-project/vllm:mainfrom

izhuhaoran:fix-async-spec-output-tokensizhuhaoran/vllm:fix-async-spec-output-tokensCopy head branch name to clipboard