Update tofu-resources to their latest versions

The API of Hetzner has got some important changes recently which will
impact my configuration. So, this maintenance change is necessary for me
to address these changes and figure out all deprecations.

First and foremost a new DNS-API was introduced in November 2025 to bind
the DNS-settings closer to their cloud console. In favor of this new
DNS-system they will phase out the old API in the beginning of May 2026!

Secondly, some API-fields have changed, e.g. the "datacenter" field of
primary IPs is going to be removed in favor of the "location" field.
This change will finally take place at 1. of July 2026.

Beside of that I simply updated all providers to their latest versions.

Reference: https://docs.hetzner.com/networking/dns/faq/beta
Reference: https://docs.hetzner.cloud/changelog#2025-11
Reference: https://docs.hetzner.cloud/changelog#2025-12

modules/hetzner/kubernetes/versions.tf

@@ -2,11 +2,11 @@ terraform {
   required_providers {
     hcloud = {
       source = "hetznercloud/hcloud"
-      version = "1.50.0"
+      version = ">= 1.60.0"
     }
     random = {
       source = "hashicorp/random"
-      version = "3.7.1"
+      version = ">= 3.8.1"
     }
   }
 }