findspark not found in an example notebook

Short description explaining the high-level reason for the new issue.

# Current behavior
go to example notebook and run it. Can't import findspark

## Stack Traces
(If applicable)

## Screenshots
(If applicable)

## Steps to replicate behavior
1.https://colab.research.google.com/github/dagworks-inc/hamilton/blob/main/examples/spark/pyspark_feature_catalog/example_usage.ipynb#scrollTo=wpnAHHzM3DLp

## Library & System Information
E.g. python version, hamilton library version, linux, etc.

# Expected behavior

# Additional context
Add any other context about the problem here.