ci: attempt to fix codecov upload errors

[zone117x]

Codecov upload step in CI is running into errors:

['error'] There was an error running the uploader: Error uploading to [https://codecov.io:](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')}

Attempt to fix this by upgrading to latest codecov action and supplying CODECOV_TOKEN

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 72.40%. Comparing base (20097fc) to head (e309b84). Report is 233 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1964 +/- ## =========================================== - Coverage 76.82% 72.40% -4.42% =========================================== Files 80 94 +14 Lines 11515 12570 +1055 Branches 2575 2870 +295 =========================================== + Hits 8846 9101 +255 - Misses 2540 3451 +911 + Partials 129 18 -111 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[github-actions[bot]]

Vercel deployment URL: https://stacks-blockchain-rl1bomras-blockstack.vercel.app :rocket:

[blockstack-devops]

:tada: This PR is included in version 7.11.0-beta.5 :tada:

The release is available on:

• npm package (@beta dist-tag)
• npm package (@beta dist-tag)
• GitHub release

Your semantic-release bot :package::rocket:

[blockstack-devops]

:tada: This PR is included in version 7.11.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: