Make apiVersion string.

Signed-off-by: Panu Horsmalahti <phorsmalahti@mirantis.com>

src/common/catalog-entities/kubernetes-cluster.ts

@@ -59,7 +59,7 @@ export interface KubernetesClusterStatus extends CatalogEntityStatus {
 }
 
 export class KubernetesCluster extends CatalogEntity<KubernetesClusterMetadata, KubernetesClusterStatus, KubernetesClusterSpec> {
-  public static readonly apiVersion = "entity.k8slens.dev/v1alpha1";
+  public static readonly apiVersion: string = "entity.k8slens.dev/v1alpha1";
   public static readonly kind: string = "KubernetesCluster";
 
   public readonly apiVersion = KubernetesCluster.apiVersion;