chore(gha): update yamllint.yml GitHub workflow

.github/workflows/yamllint.yml

@@ -18,7 +18,7 @@ jobs:
     name: Validate YAML files
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Validate YAML files
         run: |
           if [ -f .yamllint.yml ]; then
@@ -29,4 +29,16 @@ jobs:
             yamllint -d "{extends: relaxed, rules: {line-length: disable}}" .
           fi
 
+  notify:
+    needs: [validate-yaml]
+    if: failure()
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Notify
+        uses: mobsuccess-devops/github-actions-notify@master
+        with:
+          notify-type: "workflow-failure"
+          slack-token: ${{ secrets.SLACK_TOKEN_MSBOT }}
+          slack-channel: ${{ vars.SLACK_CHANNEL_NOTIFY_WORKFLOW_FAIL }}
+          platform-pat: ${{ secrets.MS_PLATFORM_LIST_USERS_PAT }}
 # DO NOT EDIT: END