ci: fix uploading artifact

.gitea/workflows/build-demo.yaml

@@ -27,8 +27,9 @@ jobs:
       - name: Run build script
         run: npm run build
 
-      - name: Upload Output
+      - name: Upload artifact
-        uses: https://gitea.com/actions/upload-artifact@v4
+        # noinspection SpellCheckingInspection
+        uses: https://gitclone.com/github.com/christopherhx/gitea-upload-artifact@v4
         with:
           name: static-website
           path: site/