Qwen3 Support

[wukong1992]

This code does not support the higher version of vllm, so the latest released models cannot be used. Is there any plan to upgrade? The codebase hasn't been updated for a long time.

[SsmallSong]

Hello! This version of openrlhf is aligned with our other work STILL-2. It is indeed relatively outdated, and we will consider migrating to veRL in the future.