Replace Codecov upload command

[olexandr-konovalov]

Use the one from their documentation page instead:

https://docs.codecov.com/docs/quick-start#step-4-upload-coverage-reports-to-codecov

[codecov[bot]]

Codecov Report

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

:exclamation: No coverage uploaded for pull request base (main@1c2fc33). Click here to learn what that means.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #55 +/- ## ====================================== Coverage ? 8.02% ====================================== Files ? 18 Lines ? 399 Branches ? 0 ====================================== Hits ? 32 Misses ? 367 Partials ? 0 ```

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