Merge pull request #160 from swcarpentry/update/packages · swcarpentry/r-novice-gapminder-es@f3838a3

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v3, actions/cache@v3.0.11. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

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