Bump ecs_sandbox::modernisation-platform-terraform-ecs-cluster

Bumps [ecs_sandbox::modernisation-platform-terraform-ecs-cluster](https://github.com/ministryofjustice/modernisation-platform-terraform-ecs-cluster) from 2.0.1 to 4.3.0.
- [Release notes](https://github.com/ministryofjustice/modernisation-platform-terraform-ecs-cluster/releases)
- [Commits](ministryofjustice/modernisation-platform-terraform-ecs-cluster@v2.0.1...v4.3.0)

---
updated-dependencies:
- dependency-name: ecs_sandbox::github::ministryofjustice/modernisation-platform-terraform-ecs-cluster::v2.0.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

terraform/environments/delius-jitbit/sandbox_ecs.tf

@@ -1,7 +1,7 @@
 module "ecs_sandbox" {
   count = local.is-development ? 1 : 0
 
-  source = "github.com/ministryofjustice/modernisation-platform-terraform-ecs-cluster//cluster?ref=v2.0.1"
+  source = "github.com/ministryofjustice/modernisation-platform-terraform-ecs-cluster//cluster?ref=v4.3.0"
 
   environment = local.environment
   name        = "${local.application_name}-sandbox"