Fix the codecov CI issue

[greyli]

Run codecov/codecov-action@v3
==> linux OS detected
https://uploader.codecov.io/latest/linux/codecov.SHA256SUM
==> SHASUM file signed by key id [8](https://github.com/waynerv/flask-mailman/actions/runs/7087108642/job/19286657878#step:7:9)06bb28aed77[9](https://github.com/waynerv/flask-mailman/actions/runs/7087108642/job/19286657878#step:7:10)869
==> Uploader SHASUM verified (b9282b8b43eef83f722646d8992c4dd36563046afe0806722184e7e9923a6d7b  codecov)
==> Running version latest
==> Running version v0.7.1
/home/runner/work/_actions/codecov/codecov-action/v3/dist/codecov -n  -Q github-action-3.1.4 -Z -f coverage.xml
[2023-12-04T13:12:57.499Z] ['info'] 
     _____          _
    / ____|        | |
   | |     ___   __| | ___  ___ _____   __
   | |    / _ \ / _` |/ _ \/ __/ _ \ \ / /
   | |___| (_) | (_| |  __/ (_| (_) \ V /
    \_____\___/ \__,_|\___|\___\___/ \_/

  Codecov report uploader 0.7.1
[2023-12-04T13:12:57.507Z] ['info'] => Project root located at: /home/runner/work/flask-mailman/flask-mailman
[2023-12-04T13:12:57.508Z] ['info'] -> No token specified or token is empty
[2023-12-04T13:12:57.516Z] ['info'] Searching for coverage files...
[2023-12-04T13:12:57.561Z] ['info'] => Found 1 possible coverage files:
  coverage.xml
[2023-12-04T13:12:57.561Z] ['info'] Processing /home/runner/work/flask-mailman/flask-mailman/coverage.xml...
[2023-12-04T13:12:57.564Z] ['info'] Detected GitHub Actions as the CI provider.
[2023-12-04T13:12:59.009Z] ['info'] Pinging Codecov: https://codecov.io/upload/v4?package=github-action-3.1.4-uploader-0.7.1&token=*******&branch=master&build=7087[10](https://github.com/waynerv/flask-mailman/actions/runs/7087108642/job/19286657878#step:7:11)8642&build_url=https%3A%2F%2Fgithub.com%2Fwaynerv%2Fflask-mailman%2Factions%2Fruns%2F7087108642&commit=39d4167c37742c228686d0d990a7fe35848fb1bb&job=dev+workflow&pr=&service=github-actions&slug=waynerv%2Fflask-mailman&name=&tag=&flags=&parent=
[2023-[12](https://github.com/waynerv/flask-mailman/actions/runs/7087108642/job/19286657878#step:7:13)-04T[13](https://github.com/waynerv/flask-mailman/actions/runs/7087108642/job/19286657878#step:7:14):12:59.281Z] ['error'] There was an error running the uploader: Error uploading to https://codecov.io: Error: There was an error fetching the storage URL during POST: 404 - {'detail': ErrorDetail(string='Unable to locate build via Github Actions API. Please upload with the Codecov repository upload token to resolve issue.', code='not_found')}
Error: Codecov: Failed to properly upload: The process '/home/runner/work/_actions/codecov/codecov-action/v3/dist/codecov' failed with exit code [25](https://github.com/waynerv/flask-mailman/actions/runs/7087108642/job/19286657878#step:7:26)5