TFSec for terraform feature being deprecated/merged into Trivy

[TFSec](https://github.com/aquasecurity/tfsec), which is listed as part of the terraform feature, is being deprecated/merged into their other tool, [Trivy](https://github.com/aquasecurity/trivy):

>Going forward we want to encourage the tfsec community to transition over to Trivy. Moving to Trivy gives you the same excellent Terraform scanning engine, with some extra benefits:

... I'm not sure what we want the behavior here to be....