Bump github actions to v4

Node.js 16 will be deprecated on 09/11/2023, refer to nodejs blog announcements[^1].
GitHub will transition actions to nodejs 20 by Spring 2024, refer to github blog[^2].
Bumps the following actions to
- actions/checkout:   v3 => v4
- actions/setup-node: v3 => v4

Refer to below link for more details:
- https://github.com/actions/checkout/releases/tag/v4.0.0
- https://github.com/actions/setup-node/releases/tag/v4.0.0
- [^1]: https://nodejs.org/en/blog/announcements/nodejs16-eol
- [^2]: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20

.github/workflows/test.yml

@@ -7,10 +7,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install nodejs
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
           node-version: 16.x