Vertex AI Challenge Lab; The link is no longer available.

Hi, I am now doing [Skill boost](https://www.cloudskillsboost.google/focuses/22019?parent=catalog) to learn vertex ai. In [the notebook](https://github.com/GoogleCloudPlatform/training-data-analyst/blob/master/quests/vertex-ai/vertex-challenge-lab/vertex-challenge-lab.ipynb), there is a link to [TensorFlow Models Github repository](https://github.com/tensorflow/models/tree/master/official/nlp/bert), but it is no longer available.
I would appreciate it if you update it to the correct one.

> The following preprocessing and encoder models in the TensorFlow 2 SavedModel format use the implementation of BERT from the [TensorFlow Models Github repository](https://github.com/tensorflow/models/tree/master/official/nlp/bert) with the trained weights released by the authors of Small BERT.