Layout/IndentationWidth: Use 2 (not 4) spaces for indentation.

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The following actions use a deprecated Node.js version and will be forced to run on node20: actions/cache@v3, actions/upload-artifact@v3. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/