ci: bump artifact actions to Node-24 majors (upload@v7, download@v8)#27
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actions/upload-artifact@v5 and download-artifact@v5 still run on Node 20 (deprecated; forced to Node 24 on runners from 2026-09-16). Bump to the latest majors, which both run node24: upload-artifact@v7, download-artifact@v8. They share the v4+ artifact backend, so the upload (build job) / download (publish jobs) pair stays compatible despite the different major numbers. publish-pypi.yaml is tag-triggered, so PR CI does not exercise it; the pair is validated at the next release tag. A mismatch would fail the publish job (download before publish) without uploading anything, so it cannot mis-publish.
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Summary
actions/upload-artifact@v5anddownload-artifact@v5still run on Node 20 (deprecated; forced to Node 24 on GitHub runners from 2026-09-16 — visible as a warning on every publish run). Bump to the latest majors, both of which runnode24:actions/upload-artifact@v5→@v7actions/download-artifact@v5→@v8(×2)Compatibility
The different major numbers (7 vs 8) are fine: both are on the v4+ artifact backend, so the upload (build job) / download (publish jobs) pair stays compatible. This is the matched-pair version of the earlier Dependabot PRs #14/#17, which were held precisely to move them together.
Validation note
publish-pypi.yamlis tag-triggered, so PR CI does not run it — the pair is validated at the next release tag. A mismatch would fail the publish job (download happens before the PyPI upload), so it cannot mis-publish — the failure mode is safe. Only YAML validity is checked here.