fix(misconf): False negative AVD-AWS-0088 when SSE algorithm has an invalid value

[nikpivkin]

Trivy does not report AVD-AWS-0088 with the following terraform configuration. Which is incorrect, since the following values are valid for the sse_algorithm attribute: AES256, aws:kms, and aws:kms:dsse.

resource "aws_s3_bucket" "this" {
    bucket = "test"
}

resource "aws_s3_bucket_server_side_encryption_configuration" "this" {
  bucket = aws_s3_bucket.this.id
  rule {
    apply_server_side_encryption_by_default {
      sse_algorithm     = ""
    }
  }
}

Ref:

• https://docs.aws.amazon.com/AmazonS3/latest/userguide/serv-side-encryption.html