Update terraform for 0.13 compatibility

.github/workflows/ci.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Install terraform
         uses: marocchino/setup-terraform@v1
         with:
-          version: "0.12.20"
+          version: "0.13.0"
       - name: Initialize Terraform
         run: ./scripts/terraform/terraform.sh init -backend=false
       - name: Lint

terraform/providers.tf

@@ -1,7 +1,5 @@
 provider "vultr" {
-  api_key     = var.vultr_api_key
-  rate_limit  = 700
-  retry_limit = 3
+  api_key = var.vultr_api_key
 }
 
 provider "cloudflare" {

terraform/terraform.tf

@@ -0,0 +1,13 @@
+terraform {
+  required_providers {
+    cloudflare = {
+      source = "cloudflare/cloudflare"
+    }
+    vultr = {
+      source = "vultr/vultr"
+    }
+    aws = {
+      source = "hashicorp/aws"
+    }
+  }
+}