Update actions/upload-pages-artifact action to v4

Author: renovate[bot]

.github/workflows/pages-generate-from-docs-dir.yml

@@ -109,7 +109,7 @@ jobs:
           destination: build/pages
 
       - name: Upload Pages artifact
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@v4
         with:
           path: build/pages