upgrade ingress to newest available release

[razvan-moj]

Background

We have a memory leak (https://github.com/kubernetes/ingress-nginx/issues/8166) that is hard to debug. Two new releases are available, 1.3 and 1.4

• 1.3 is the safest choice, should be easy to install, only concern is to make sure it doesn't attempt to recreate the Load Balancers
• 1.4 docs say upstream has deprecated K8s 1.21 (https://github.com/kubernetes/ingress-nginx/releases); test that assertion, suggest further path

Approach

Change in https://github.com/ministryofjustice/cloud-platform-terraform-ingress-controller/blob/main/main.tf#L45

Definition of done

• [ ] new release in live
• [ ] another team member has reviewed
• [ ] smoke tests are green