Use GHES-compatible artifact upload

.gitea/workflows/build-readme.yml

@@ -27,7 +27,7 @@ jobs:
         run: python build/scripts/render_client_items.py --manifest build/renameable-items.json --pack-root resourcepack --output-dir build
 
       - name: Publish generated catalog artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: renameable-item-catalog
           path: |