[Bugfix] Fix OpenAI parallel sampling when using xgrammar#11637

DarkLight1337 merged 2 commits intovllm-project:mainvllm-project/vllm:mainfrom

neuralmagic:fix-xgrammar-openai-parallel-samplingneuralmagic/vllm:fix-xgrammar-openai-parallel-samplingCopy head branch name to clipboard