Update github actions to use Node.js 20

[igomur]

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: felixmosh/turborepo-gh-artifacts@v2, actions/cache@v3, BerniWittmann/background-server-action@v1, actions/upload-artifact@v3. For more information see: github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20.