ci: update Codecov action to v5

[marten-seemann]

No description provided.

[Copilot]

Pull Request Overview

This PR upgrades the Codecov GitHub Action to v5, adds a guard to skip uploads when a workflow run is canceled, and simplifies the files and env_vars configuration.

• Bumps codecov/codecov-action from v4 to v5
• Introduces if: ${{ !cancelled() }} to skip canceled runs
• Streamlines files list and env_vars syntax

Comments suppressed due to low confidence (1)

.github/workflows/unit.yml:39

• The removal of coverage-root.txt from the files list may exclude coverage data generated at the repository root. If you need to merge multiple coverage outputs, either include all relevant files or combine them before uploading.

          files: coverage.txt

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.98%. Comparing base (3bb6b0c) to head (7dc5b1e).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #47   +/-   ##
=======================================
  Coverage   87.98%   87.98%           
=======================================
  Files           8        8           
  Lines         674      674           
=======================================
  Hits          593      593           
  Misses         62       62           
  Partials       19       19           

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