fix: revert deploy-pages to v4, force Node.js 24 via env var

Author: sigma

.github/workflows/docs.yml

@@ -14,6 +14,9 @@ concurrency:
   group: pages
   cancel-in-progress: true
 
+env:
+  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
+
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -39,4 +42,4 @@ jobs:
       url: ${{ steps.deployment.outputs.page_url }}
     steps:
       - id: deployment
-        uses: actions/deploy-pages@v5
+        uses: actions/deploy-pages@v4