Codecov upload is not working

[tnixon]

Recent build (see, eg: https://github.com/databrickslabs/tempo/actions/runs/6277214083) have failed because the GH action to upload the code coverage report to codecov.io is failing. Tests seem to succeed, but the upload fails with the following message:

Pinging Codecov: https://codecov.io/upload/v4?package=github-action-3.1.4-uploader-0.6.2&token=*******&branch=issue_362&build=6277214083&build_url=https%3A%2F%2Fgithub.com%2Fdatabrickslabs%2Ftempo%2Factions%2Fruns%2F6277214083&commit=78fc76e7bb794843106c9c8931f2367be45da660&job=build&pr=363&service=github-actions&slug=databrickslabs%2Ftempo&name=&tag=&flags=&parent=
[2023-09-22T17:22:14.499Z] ['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')}
Error: Codecov: Failed to properly upload: The process '/home/runner/work/_actions/codecov/codecov-action/v3/dist/codecov' failed with exit code 255