maint: update actions/upload-artifact from v3 to v4 in CI workflow

Author: modesty

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
         run: npm run build
 
       - name: Upload build artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: build-output
           path: |