No module named 'dill' error

I am currently doing the labs of your course "Production Machine Learning Systems".
Now Jupyter Lab 4 is preinstalled in a new workbench instance of Vertex AI.

When running the cell:
```
import pandas as pd
import tensorflow_data_validation as tfdv
import sys
import warnings
warnings.filterwarnings('ignore')

print('Installing TensorFlow Data Validation')
!pip install -q tensorflow_data_validation[visualization]
```

For both notebook:
- https://github.com/GoogleCloudPlatform/training-data-analyst/blob/master/courses/machine_learning/deepdive2/production_ml/labs/tfdv_advanced_taxi.ipynb
- https://github.com/GoogleCloudPlatform/training-data-analyst/blob/master/courses/machine_learning/deepdive2/production_ml/labs/tfdv_basic_spending.ipynb

This PR (https://github.com/GoogleCloudPlatform/training-data-analyst/pull/3052) fixes the problem by installing dill