Upgrade our terraform template dependencies with renovate bot

We should update our terraform template dependencies.

The following discussion from !5 (merged) should be addressed:

• @Alexand started a discussion:

  I can confirm that after a manual QA, I was able to provision an EKS cluster with this version and get my agent connected to it.

  Although, now I'm also asking myself, whether we shouldn't run terraform init -upgrade to generate a new dependency-lock file with updated with a new registry.terraform.io/hashicorp/kubernetes provider version. Anyway, I think locking this module also makes sense, and already fixes the bug. So we can update the other dependencies in a follow-up issue!

Proposal

Introduce the renovatebot and use it to trigger new dependency MRs.

Example renovate.json from Viktor's personal project

{
  "extends": [
    "config:base",
    ":disableDependencyDashboard"
  ],
  "labels": [
    "type::maintenance"
  ],
  "packageRules": [
    {
      "automerge": false,
      "description": "Terraform updates",
      "managers": [
        "terraform"
      ],
      "matchUpdateTypes": [
        "patch",
        "pin",
        "digest",
        "minor",
        "major"
      ]
    }
  ]
}