chore(deps): update terraform terraform-ibm-modules/icd-postgresql/ibm to v4.2.6 (#697)

Author: terraform-ibm-modules-ops

examples/advanced/main.tf

@@ -65,7 +65,7 @@ module "vpe_security_group" {
 
 module "postgresql_db" {
   source              = "terraform-ibm-modules/icd-postgresql/ibm"
-  version             = "4.2.4"
+  version             = "4.2.6"
   resource_group_id   = module.resource_group.resource_group_id
   name                = "${var.prefix}-vpe-pg"
   region              = var.region