* policy-engine to v0.18.1

* policy-engine to v0.18.0 to add support for newer Terraform syntax (#…

…388)

* policy-engine to fix panic from null variables (#389)

* go version to 1.18

* support for_each for resources in tf loader

* switch to hcl_interpreter from policy-engine (#383)
* resources IDs for tf resources that have count set now use the `aws_s3_bucket.my_bucket[0]` format
* FG_R00252 should support arrays for condition values (#380)
* FG_R00329 has wrong property name (#368)

* Support for .tf.json files - including those output by Terraform CD…

…K's `cdktf synth` command.

* fix panic in EnrichResources

* false positive for rule FG_R00031

* panic on empty rego file
* bump OPA to v0.43.1

* Support for remediation doc to regotools metadoc (#352 authored by @…

…darrendao)

* Panic when using both Terraform and Regula as go libraries (#350 au…

…thored by @craigfurman)

* Updated OPA to v0.43.0
* Updated alpine to v3.16 in Dockerfile

* fix severities for passing rules