Resolve argument deprecation warning

[alexzimmer96]

Running the project results in a deprecation notice

│ Warning: Argument is deprecated
│ 
│   with module.cluster_init.hcloud_load_balancer.rancher_management_lb,
│   on module-cluster-init/resources_hetzner.tf line 70, in resource "hcloud_load_balancer" "rancher_management_lb":
│   70: resource "hcloud_load_balancer" "rancher_management_lb" {
│ 
│ Use hcloud_load_balancer_target resource instead. This allows the full control over the selected targets.
│ 
│ (and one more similar warning elsewhere)

The warning should be resolved by using the hcloud_load_balancer_target resource.