deps(actions): Bump actions/download-artifact from 6 to 8

Error retrieving diff main...trendvidia:dependabot/github_actions/actions/download-artifact-8: Not Found - https://docs.github.com/rest/commits/commits#compare-two-commits

Cannot build an overlay database because build-mode is set to "undefined" instead of "none". Falling back to creating a normal full database instead.

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