feat!: bump required Terraform version to >=1.9.0

- Add new versions to CI matrix

BREAKING CHANGE: Drop Terraform 1.8.x support

Author: mrclrchtr

.github/workflows/dev-experience.yml

@@ -28,8 +28,12 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - version: ~1.8.0
           - version: ~1.9.0
+          - version: ~1.10.0
+          - version: ~1.11.0
+          - version: ~1.12.0
+          - version: ~1.13.0
+          - version: ~1.14.0
     steps:
       - name: Checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

terraform.tf

@@ -1,5 +1,5 @@
 terraform {
-  required_version = ">=1.8.0"
+  required_version = ">=1.9.0"
 
   required_providers {
     hcloud = {