fix: update upload-artifact action to v4 in CI workflow

Author: lucaforni

.github/workflows/ci.yml

@@ -66,7 +66,7 @@ jobs:
         run: npm run build
 
       - name: Upload build artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: dist
           path: dist/