Update cloudfoundry/cf-deployment-concourse-tasks Docker tag to v20

Author: renovate[bot]

terraform-modules/concourse/automatic_certificate_regeneration/cron_job.tf

@@ -16,7 +16,7 @@ resource "kubernetes_cron_job_v1" "automatic_certificate_regeneration" {
             restart_policy = "OnFailure"
             container {
               name              = "cert-regen"
-              image             = "cloudfoundry/cf-deployment-concourse-tasks:v19.0.0"
+              image             = "cloudfoundry/cf-deployment-concourse-tasks:v20.4.0"
               image_pull_policy = "IfNotPresent"
               command           = ["bash", "-c", "IFS=',' read -r -a CERTIFICATES <<< \"$CERTS_TO_RENEW\"; for cert in \"$${CERTIFICATES[@]}\"; do credhub regenerate -n \"$cert\"; done"]
               env {

terraform-modules/concourse/e2e_test/credhub_test_secret_k8s.tf

@@ -40,7 +40,7 @@ resource "kubernetes_job" "credhub_cli" {
       spec {
         restart_policy = "Never"
         container {
-          image = "cloudfoundry/cf-deployment-concourse-tasks:v19.0.0"
+          image = "cloudfoundry/cf-deployment-concourse-tasks:v20.4.0"
           name  = "credhub-cli"
 
           command = [