Upgrade QUnit to latest version

plugins/poll/test/javascripts/widgets/discourse-poll-option-test.js.es6

@@ -8,7 +8,7 @@ const template = `{{mount-widget
 widgetTest('single, not selected', {
   template,
 
-  setup() {
+  beforeEach() {
     this.set('option', { id: 'opt-id' });
     this.set('vote', []);
   },
@@ -21,7 +21,7 @@ widgetTest('single, not selected', {
 widgetTest('single, selected', {
   template,
 
-  setup() {
+  beforeEach() {
     this.set('option', { id: 'opt-id' });
     this.set('vote', ['opt-id']);
   },
@@ -34,7 +34,7 @@ widgetTest('single, selected', {
 widgetTest('multi, not selected', {
   template,
 
-  setup() {
+  beforeEach() {
     this.setProperties({
       option: { id: 'opt-id' },
       isMultiple: true,
@@ -50,7 +50,7 @@ widgetTest('multi, not selected', {
 widgetTest('multi, selected', {
   template,
 
-  setup() {
+  beforeEach() {
     this.setProperties({
       option: { id: 'opt-id' },
       isMultiple: true,

plugins/poll/test/javascripts/widgets/discourse-poll-standard-results-test.js.es6

@@ -8,7 +8,7 @@ const template = `{{mount-widget
 widgetTest('options in descending order', {
   template,
 
-  setup() {
+  beforeEach() {
     this.set('poll', Ember.Object.create({
       options: [{ votes: 5 }, { votes: 4 }],
       voters: 9
@@ -24,7 +24,7 @@ widgetTest('options in descending order', {
 widgetTest('options in ascending order', {
   template,
 
-  setup() {
+  beforeEach() {
     this.set('poll', Ember.Object.create({
       options: [{ votes: 4 }, { votes: 5 }],
       voters: 9
@@ -40,7 +40,7 @@ widgetTest('options in ascending order', {
 widgetTest('multiple options in descending order', {
   template,
 
-  setup() {
+  beforeEach() {
     this.set('isMultiple', true);
     this.set('poll', Ember.Object.create({
       type: 'multiple',