Bump Regula dependency to latest git.

[evan-fugue]

This is so we make use of HuJSON to parse the JSON in Rego metadoc
blocks, which allows trailing commas and comments.

For example, you can test with the rule:

__rego__metadoc__ := {
  "id": "FG_R00011",
  "title": "CloudFront viewer protocol policy should be set to https-only or redirect-to-https",
  "description": "CloudFront viewer protocol policy should be set to https-only or redirect-to-https. CloudFront connections should be encrypted during transmission over networks that can be accessed by malicious individuals. A CloudFront distribution should only use HTTPS or Redirect HTTP to HTTPS for communication between viewers and CloudFront.",
  "custom": {
    "severity": "Medium",
    "families": [
      "More rules",
      "e6f9b788-1841-4466-8db7-28d2f08da2ff"
    ],
    "provider": "AWS",
  }
}

resource_type = "AWS.EC2.Instance"

approved_amis = {
  "ami-04b762b4289fba92b"
}

allow {
    ami = input.ami  # Pull out AMIs
    approved_amis[ami]  # Assert
}

Note the comma after "provider": "AWS" at the end of the metadoc block.