infra: update cert-manager version

Author: CallMeLeopoldo

.do/k8s-cluster/Makefile

@@ -6,7 +6,7 @@ TF ?= $(TF_EXTRA_OPTS) terraform
 WORKSPACE ?= ${DO_TF_WORKSPACE}
 VARS_FILE ?= deploy.tfvars
 NGINX_INGRESS_VERSION ?= 4.11.3
-CERT_MANAGER_VERSION ?= v1.15.0
+CERT_MANAGER_VERSION ?= v1.15.3
 K8S_VERSION ?= 1.33
 DO_K8S_SLUG ?= $(shell doctl kubernetes options versions | grep $(K8S_VERSION) | awk '{print $$1}')
 NODE_TYPE ?= s-8vcpu-32gb