chore: update GH Actions for newer node versions

[andypiper]

The build and deploy Action is currently reporting a number of deprecations and recommending updates:

The following actions uses Node.js version which is deprecated and will be forced to run on node20: 
actions/checkout@v3, actions/configure-pages@v2, peaceiris/actions-hugo@v2, 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/

deploy
The following actions uses Node.js version which is deprecated and will be forced to run on node20: 
actions/deploy-pages@v1. 
For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

Deprecation notice: v1, v2, and v3 of the artifact actions
The following artifacts were uploaded using a version of actions/upload-artifact that is scheduled for deprecation: "github-pages".
Please update your workflow to use v4 of the artifact actions.
Learn more: https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/