chore: Update Node.js versions in CI workflow

I've updated the GitHub Actions CI workflow to use more recent Node.js versions.

- I modified the `node-version` matrix to `[20.x, 22.x]`.
- I updated `actions/checkout` from `v2` to `v4`.
- I updated `actions/setup-node` from `v1` to `v4`.
- I enabled npm caching in the `setup-node` step.
- I ensured `npm test` is always executed.

Author: google-labs-jules[bot]

.github/workflows/node.js.yml

@@ -16,14 +16,15 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [12.x, 14.x, 16.x, 17.x, 18.x, 19.x]
+        node-version: [20.x, 22.x]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v1
+      uses: actions/setup-node@v4
       with:
         node-version: ${{ matrix.node-version }}
+        cache: 'npm' # Added npm caching
     - run: npm ci
     - run: npm run build --if-present
-    - run: npm test --if-present
+    - run: npm test # Removed --if-present, tests should always run