bump k8s to 1.31 (#177)

Signed-off-by: Jorge Turrado <jorge_turrado@hotmail.es>

Author: JorTurFer

terraform/main.tf

@@ -92,7 +92,7 @@ module "acr_proxy" {
 module "azure_aks_pr" {
   source              = "./modules/azure/aks"
   resource_group_name = var.azure_resource_group_name
-  kubernetes_version  = "1.30"
+  kubernetes_version  = "1.31"
   cluster_name        = local.pr_cluster_name
   unique_project_name = var.unique_project_name
   location            = "northeurope"
@@ -119,7 +119,7 @@ module "azure_aks_pr" {
 module "azure_aks_nightly" {
   source              = "./modules/azure/aks"
   resource_group_name = var.azure_resource_group_name
-  kubernetes_version  = "1.30"
+  kubernetes_version  = "1.31"
   cluster_name        = local.main_cluster_name
   unique_project_name = var.unique_project_name
   location            = "northeurope"