Fix "an artifact with this name already exists on the workflow run"

[jeroen]

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Two days ago my tap started failing because the upstream actions/upload-artifact@main was bumped to v4. This version no longer allows to upload artifacts with the same name for multiple jobs.

Example: https://github.com/autobrew/homebrew-cran/actions/runs/7232216444

So we either need to make the name parameter unique or stick with v3 for now.

[Bo98]

Yeah we're sticking with v3 ourselves until we figure out the best way to handle v4, probably after the new year.

[jeroen]

FYI, v4 is very buggy right now, don't upgrade yet: actions/download-artifact#249

[Bo98]

We're aware, though there's still stuff we have to do anyway before v4 can be adopted and that work will work with the existing v3.