Add forcenew back to auth type

Author: sfang97

gitlab/resource_gitlab_instance_cluster.go

@@ -80,7 +80,7 @@ func resourceGitlabInstanceCluster() *schema.Resource {
 			"kubernetes_authorization_type": {
 				Type:     schema.TypeString,
 				Optional: true,
-
+				ForceNew: true,
 				Default:      "rbac",
 				ValidateFunc: validation.StringInSlice([]string{"rbac", "abac", "unknown_authorization"}, false),
 			},