update actions/checkout version to v4 on intro docs and Github actions chromatic workflow

chromaui / learnstorybook.com

Static site and content for Storybook tutorials

https://storybook.js.org/tutorials/

MIT License

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update actions/checkout version to v4 on intro docs and Github actions chromatic workflow #754

Open Yoshino-Yukitaro opened 5 months ago

Yoshino-Yukitaro commented 5 months ago

The latest version of the actions/checkout workflow is v4, but the version of this documentation's it is older. So, This PR updates actions/checkout version to v4.