Config `log_retention_in_days` not working

Whenever we are using `log_retention_in_days ` attribute within our chalice configuration we are getting "Feature Unsupported exception"

`chalice.package.UnsupportedFeatureError: LogGroup(resource_name='api_handler-log-group', log_group_name='/aws/lambda/xxx-api_handler', retention_in_days=7)`

We are using chalice version `1.29.0`

Start by reproducing the configuration using the `log_retention_in_days` attribute on Chalice 1.29.0 and inspect the `chalice.package.UnsupportedFeatureError` involving the generated LogGroup. Done means the configuration deploys without that exception and the Lambda log group receives the requested seven-day retention.

Written by the indexing model from the issue text.