fix(k8s): update labels to adhere to best practices

Change labels in the deployment and service configurations from the 
custom format to the standard Kubernetes naming convention. This 
improves consistency and compatibility with Kubernetes tools and 
enhances maintainability.

k8s/deploy.yaml

@@ -6,11 +6,11 @@ spec:
   replicas: 1
   selector:
     matchLabels:
-      app: auth0mock
+      app.kubernetes.io/name: auth0mock
   template:
     metadata:
       labels:
-        app: auth0mock
+        app.kubernetes.io/name: auth0mock
     spec:
       containers:
         - name: auth0mock
@@ -36,10 +36,10 @@ kind: Service
 metadata:
   name: auth0mock
   labels:
-    app: auth0mock
+    app.kubernetes.io/name: auth0mock
 spec:
   ports:
     - port: 3333
   selector:
-    app: auth0mock
+    app.kubernetes.io/name: auth0mock
   type: ClusterIP