Codecov dependency needs to upgrade

[zmcNotafraid]

These days CI always run failed.From the error message it outputs {'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')}.

From the codecov gem ,we can see this word Find you repo token on your repo page at [codecov.io](https://codecov.io/). Repo tokens are not required for public repos on Travis-Ci, CircleCI, or AppVeyor CI. and this gem was deprecated.

So we need to follow their notice to use this https://github.com/marketplace/actions/codecov instead.

[zmcNotafraid]

PR: nervosnetwork/ckb-explorer#1768