bump: Upgrade do cluster to 1.22 (#747)

Author: h314to

.do/k8s-cluster/Makefile

@@ -7,7 +7,7 @@ WORKSPACE ?= ${DO_TF_WORKSPACE}
 VARS_FILE ?= deploy.tfvars
 NGINX_INGRESS_VERSION ?= 2.16.0
 CERT_MANAGER_VERSION ?= v0.15.1
-K8S_VERSION ?= 1.20
+K8S_VERSION ?= 1.22
 DO_K8S_SLUG ?= $(shell doctl kubernetes options versions | grep $(K8S_VERSION) | awk '{print $$1}')
 NODE_TYPE ?= s-8vcpu-32gb
 NODES_MIN ?= 7
@@ -95,4 +95,4 @@ tf_init:
 
 .PHONY: tf_validate
 tf_validate:
-	$(TF) validate
+	$(TF) validate