chore: add Codecov reports to GitHub workflow

Author: webdiscus

.github/workflows/test.yml

@@ -74,8 +74,8 @@ jobs:
         env:
           NODE_OPTIONS: --unhandled-rejections=strict
 
-      - name: Submit coverage data to codecov
-        uses: codecov/codecov-action@v3
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v5
         with:
-          flags: test
           token: ${{ secrets.CODECOV_TOKEN }}
+          slug: webdiscus/flaget