Update GitHub Actions to v4 and Node 20

- actions/checkout v2 -> v4
- actions/setup-node v1 -> v4 with built-in caching
- actions/cache v1 removed (now handled by setup-node)
- Node 16 -> 20

Amp-Thread-ID: https://ampcode.com/threads/T-019c00e7-1e04-742b-aded-3416acb020cd
Co-authored-by: Amp <amp@ampcode.com>

Author: carsonfarmer

.github/workflows/review.yml

@@ -14,23 +14,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout 🛎️
-        uses: actions/checkout@v2.3.1
-        with:
-          persist-credentials: false
+        uses: actions/checkout@v4
 
-      - name: Cache 📦
-        uses: actions/cache@v1
-        with:
-          path: ~/.npm # npm cache files are stored in `~/.npm` on Linux/macOS
-          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
-          restore-keys: |
-            ${{ runner.os }}-build-${{ env.cache-name }}-
-            ${{ runner.os }}-build-
-            ${{ runner.os }}-
       - name: Setup Node Environment ⬢
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v4
         with:
-          node-version: 16
+          node-version: 20
+          cache: 'npm'
 
       - name: Install 🔧
         run: npm install