update server CI GH Actions to use node 20

.github/workflows/server-ci.yml

@@ -10,20 +10,16 @@ jobs:
   build-and-test:
     runs-on: ubuntu-latest
 
-    strategy:
-      matrix:
-        node-version: [18.x, 20.x]
-
     steps:
       #1 Checkout the code
       - name: Checkout Repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       #2 Setup Node.js environment
-      - name: Setup Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v3
+      - name: Setup Node.js Environment
+        uses: actions/setup-node@v4
         with:
-          node-version: ${{ matrix.node-version }}
+          node-version: "20"
           cache: "npm"
           cache-dependency-path: server/package-lock.json