Update model weights link

Signed-off-by: heyufan1995 <[email protected]>

vista3d/README.md

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 # MONAI **V**ersatile **I**maging **S**egmen**T**ation and **A**nnotation
-[[`Paper`](https://arxiv.org/pdf/2406.05285)] [[`Demo`](https://build.nvidia.com/nvidia/vista-3d)] [[`Checkpoint`]](https://drive.google.com/file/d/1eLIxQwnxGsjggxiVjdcAyNvJ5DYtqmdc/view?usp=sharing)
+[[`Paper`](https://arxiv.org/pdf/2406.05285)] [[`Demo`](https://build.nvidia.com/nvidia/vista-3d)] [[`Checkpoint`]](https://developer.download.nvidia.com/assets/Clara/monai/tutorials/model_zoo/model_vista3d.pt)
 ## Overview
 
 The **VISTA3D** is a foundation model trained systematically on 11,454 volumes encompassing 127 types of human anatomical structures and various lesions. It provides accurate out-of-the-box segmentation that matches state-of-the-art supervised models which are trained on each dataset. The model also achieves state-of-the-art zero-shot interactive segmentation in 3D, representing a promising step toward developing a versatile medical image foundation model.