deps: upgrade to terraform 0.13

versions.tf

@@ -0,0 +1,18 @@
+terraform {
+  required_providers {
+    hcloud = {
+      source = "hetznercloud/hcloud"
+      version = "~> 1.30"
+    }
+    random = {
+      source = "hashicorp/random"
+    }
+    template = {
+      source = "hashicorp/template"
+    }
+    tls = {
+      source = "hashicorp/tls"
+    }
+  }
+  required_version = ">= 0.13"
+}