ci: add setup-node@v6 (Node 24) to PR workflow

npm ci fails on ubuntu-latest (Node 20) because package.json requires
node >=22.0.0. Build-Test-And-Deploy.yml already uses Node 24 via
setup-node@v6  apply the same step to the PR workflow.

Author: BenjaminMichaelis

.github/workflows/PR-Build-And-Test.yml

@@ -11,6 +11,11 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
+      - name: Set up Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: 24
+
       - name: Set up .NET Core
         uses: actions/setup-dotnet@v5
         with: