Upgrade gatekeeper. Module 1.3.0

[angelbarrera92]

Ciao team!

This PR contains an update of the OPA module. It has not a lot of changes, minor upgrade.

Changelog

• Update OPA Gatekeeper version from: 3.1.1 to 3.2.2
• Include Gatekeeper Policy Manager, GPM, from our amazing @ralgozino. 0.4.0.
• Adds excludeIstio flag to:
  • K8sLivenessProbe
  • K8sReadinessProbe
  • SecurityControls This feature excludes the checks on istio sidecar containers.
• Improve k8suniqueingresshost constraint template to check path + host tuple instead of just the host. Thanks to @phisco who made it possible.
• Kubernetes support:
  • Deprecate Kubernetes 1.16 support.
  • Kubernetes 1.19 is considered stable.
  • Add tech-preview support to Kubernetes 1.20.

Pipeline: http://ci.sighup.io/sighupio/fury-kubernetes-opa/151

The upgrade procedure has been tested manually.

Thanks!