Updates Portal RDS version to 12.8

to be tagged v3.2.8

base/customer_portal/rds.tf

@@ -24,7 +24,7 @@ resource "aws_db_instance" "postgres" {
   deletion_protection         = var.environment == "test" ? "false" : "true"
   delete_automated_backups    = "true"
   engine                      = "postgres"
-  engine_version              = var.environment == "test" ? "12" : "10"
+  engine_version              = var.environment == "test" ? "12" : "12.8"
   final_snapshot_identifier   = "customerportal"
   instance_class              = "db.t2.small"
   identifier                  = "customerportal"