chore: Upgrade vue-i18n to 8.x (#1383)

Co-authored-by: Pranav Raj S <pranav@thoughtwoot.com>

app/javascript/dashboard/components/layout/specs/AvailabilityStatus.spec.js

@@ -8,7 +8,11 @@ import i18n from 'dashboard/i18n';
 const localVue = createLocalVue();
 localVue.use(Vuex);
 localVue.use(VueI18n);
-localVue.locale('en', i18n.en);
+
+const i18nConfig = new VueI18n({
+  locale: 'en',
+  messages: i18n,
+});
 
 describe('AvailabilityStatus', () => {
   const currentUser = { availability_status: 'online' };
@@ -40,6 +44,7 @@ describe('AvailabilityStatus', () => {
     availabilityStatus = mount(AvailabilityStatus, {
       store,
       localVue,
+      i18n: i18nConfig,
     });
   });