fix(ci): revert deploy-pages to v4 (v5 does not exist)

Author: NkD

.github/workflows/deploy.yml

@@ -37,4 +37,4 @@ jobs:
       url: ${{ steps.deployment.outputs.page_url }}
     steps:
       - id: deployment
-        uses: actions/deploy-pages@v5
+        uses: actions/deploy-pages@v4