revert back to v5

Author: Xiangs18

.github/workflows/test.yml

@@ -48,7 +48,7 @@ jobs:
           docker compose run web test
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           fail_ci_if_error: true