actions/checkout v5.0.0 -> v7.0.1
actions/upload-artifact v6.0.0 -> v7.0.2
actions/download-artifact v4.3.0 -> v8.0.2
docker/setup-buildx-action v4.3.0 -> v4.4.1
Each stays pinned to a commit, with the version in its comment.
From the release notes, what the new majors change and why none of it
touches these workflows: download-artifact v5 moved the path of an
artifact fetched by ID, and ours is fetched by name; v8 fails on a
checksum mismatch where v4 said nothing, which is what a publish job
wants. checkout v7 refuses a fork's code under pull_request_target and
workflow_run, and the one workflow_run here checks nothing out. The
Node 24 releases need runner 2.327.1; ours run 2.337.0.
Pinned actions do not update themselves, so .github/dependabot.yml asks
for one grouped pull request a week.
