blank-imports: a blank import should be only in a main or test package, or have a comment justifying it (revive)

issues found

The following actions uses Node.js version which is deprecated and will be forced to run on node20: actions/checkout@v3, technote-space/get-diff-action@v6.1.2. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/