ci: Update GitHub Actions to latest versions

Upgraded `actions/checkout` and `actions/setup-node` to v4. Changed Node.js version from 16 to 20 and streamlined the node modules caching process to use built-in caching. Removed unnecessary steps and streamlined the workflow for better performance.

.github/workflows/test.yml

@@ -9,29 +9,20 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           ref: ${{ github.head_ref }}
 
       - name: Set up Node.js environment
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
-          node-version: '16'
-
-      - name: Cache Node.js modules
-        uses: actions/cache@v3
-        with:
-          path: ~/.npm
-          key: ${{ runner.OS }}-node-${{ hashFiles('package-lock.json') }}
-          restore-keys: |
-            ${{ runner.OS }}-node-
-            ${{ runner.OS }}-
+          node-version: '20'
+          cache: npm
 
       - name: Install
         run: npm ci
-        
+
       - name: Test
         run: |
-          set -eu
           npm run lint
           npm run test