Lambda code does not automatically deploy

The lambda code does not automatically deploy if it is updated. Consider two potential solutions:

1. Transform the CloudFormation stack into a SAM template
2. Dynamically create the S3 bucket and create a custom step to upload the function code with a DependsOn relationship from the lambda functions to the custom step (e.g. https://aws.amazon.com/blogs/infrastructure-and-automation/deploying-aws-lambda-functions-using-aws-cloudformation-the-portable-way/)