[misc] feat: Update news section in README.md (verl-project#4646)

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Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: vermouth1992

README.md

@@ -44,6 +44,7 @@ verl is fast with:
 </p>
 
 ## News
+- [2025/12] [Mind Lab](https://macaron.im/mindlab) successfully used [verl](https://github.com/volcengine/verl) and [Megatron-bridge](https://github.com/NVIDIA-NeMo/Megatron-Bridge) to train GRPO Lora for Trillion-parameter model on 64 H800 - See their [techblog](https://macaron.im/mindlab/research/building-trillion-parameter-reasoning-rl-with-10-gpus).
 - [2025/11] recipes have been moved to a new repository: [verl-recipe](https://github.com/verl-project/verl-recipe)
 - [2025/10] verl is presented in the [PyTorch Conference 2025](https://pytorch.org/event/pytorch-conference-2025/).
 - [2025/08] verl is presented in the [PyTorch Expert Exchange Webinar](https://www.youtube.com/watch?v=Vd79NmmqY3Q&t=2s). [Slides](https://github.com/eric-haibin-lin/verl-community/blob/main/slides/verl_talk_pytorch_2025_08.pdf) available.