chore: downgrade codecov github action

[arnoud-dv]

The codecov action was upgraded to v4 a few months ago but this seems to require additional configuration over v3.

Since the upgrade, no code coverage reports were uploaded for main anymore as it fails with error:

info - 2024-05-27 18:16:24,691 -- ci service found: github-actions
Error: Codecov token not found. Please provide Codecov token with -t flag.
Warning: Codecov: Failed to properly create commit: The process '/home/runner/work/_actions/codecov/codecov-action/v4/dist/codecov' failed with exit code 1

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Name	Status	Preview	Comments	Updated (UTC)
query	⬜️ Ignored (Inspect)	Visit Preview		Jun 1, 2024 0:59am

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