Add environment variable for Node version

Set environment variable to force JavaScript actions to use Node 24.

Author: Student-Annika

.github/workflows/deploy.yml

@@ -3,6 +3,9 @@ name: Deploy Next.js to GitHub Pages
 on:
   workflow_dispatch:
 
+env:
+  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
+
 permissions:
   contents: read
   pages: write