chore: Update the codecov action.

[Artmann]

We are getting this warning in the CI

This action is being deprecated in favor of 'codecov-action'.
Please update CI accordingly to use 'codecov-action@v5' with
'report_type: test_results'.
The 'codecov-action' should and can be run at least once for
coverage and once for test results

Summary by CodeRabbit

• Chores
  • Updated CI/CD test result reporting infrastructure to use the latest version of the testing framework integration.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

📝 Walkthrough

Walkthrough

The CI workflow updates the Codecov integration for test result uploads. The legacy test-results-action (v1) is replaced with codecov-action (v5). An explicit report_type: test_results parameter is added to the newer action, clarifying the upload intent. The configuration maintains existing parameters for OIDC authentication, file paths, and failure handling. This is a direct migration to Codecov's current tooling with no functional behavior changes to the CI pipeline.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	Title accurately describes the main change: updating the Codecov GitHub action from v1 to v5.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

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_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0%. Comparing base (ada6fe3) to head (ccc231d).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@     Coverage Diff     @@
##   main   #280   +/-   ##
===========================
===========================

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