update node:20 -> node:24

Author: DevCTx

.github/workflows/test.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@5
 
       # --- Bring up the 3 identical web app containers (one image, 3 instances) ---
       - name: Build & start the web app containers