chore: update to actions/setup-node@v4

chore: use built-in cache

.github/workflows/CI.yml

@@ -8,9 +8,10 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v4
     - name: Use Node.js
-      uses: actions/setup-node@v2
+      uses: actions/setup-node@v4
       with:
         node-version: 20
+        cache: 'npm'
     - name: Install dependencies
       run: npm ci
     - name: Build