GitHub Actions upgrade brief: what changes when a workflow moves an action from one version to another (actions/checkout v3 to v4, setup-node, upload-artifact, any owner/repo[/path]). Breaking changes from release notes, CHANGELOG and migration docs, action.yml diff (removed, renamed or new required inputs, changed defaults, removed outputs), Node runtime change (node16/node20 removed, node24), deprecations, concrete workflow edits with the SHA pin, and sources.

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