[ci] update actions to v4

* See deprecation notice: https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/
* Let's update all `actions` packages to v4

Author: nan-li

.github/workflows/ci.yml

@@ -8,9 +8,9 @@ jobs:
   build:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: '[Setup] Node'
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
           node-version: 16
       - name: '[Setup] Dependencies'
@@ -20,7 +20,7 @@ jobs:
 
       - name: Unit tests results
         if: failure()
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: unit-tests-results
           path: .