Revisit upgrading to the problematic `actions/upload-artifact@v4`

[abelbraaksma]

Relevant discussion in this revert: #212.

Note: this update from v3 -> v4 is COMPLETELY INCOMPATIBLE (see: actions/upload-artifact#472 and dorny/test-reporter#343) and there's no clear guideline to be found on the horizon yet....

[github-actions]

🤖 This is an automated response from Repo Assist.

Looking at the current CI configuration, it appears this issue has already been resolved: both test jobs in .github/workflows/test.yaml now use actions/upload-artifact@v4, and the companion .github/workflows/test-report.yaml reads from those v4 artifacts using dorny/test-reporter@v2 with the artifact: field (the approach that is compatible with v4 for fork PRs).

If CI test reports are working correctly in practice, this issue may be safe to close. If there are still any remaining problems, feel free to leave notes here — happy to help investigate further.

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