fix: bump the GitHub Actions upload-artifact version

[David-Wobrock]

Relates to https://github.blog/changelog/2024-02-13-deprecation-notice-v1-and-v2-of-the-artifact-actions/
and failing builds because of this: https://github.com/ory/kratos/actions/runs/10789014984/job/29921225239?pr=4086#step:1:36

Related issue(s)

Checklist

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Further Comments

[David-Wobrock]

Superseded by #4088 maybe :)

[hperl]

Superseded by #4088 maybe :)

Yes, maybe. I found that the upload action now wants distinct names for the individual items, which I addressed in that PR.

[alnr]

Fixed in #4085, thanks!