Switch to Node 20 to match WP core defaults

[tomjn]

WP Core and Gutenberg use Node 20, and have nvm rc files if that changes:

• https://github.com/WordPress/gutenberg/blob/trunk/.nvmrc
• https://github.com/WordPress/wordpress-develop/blob/trunk/.nvmrc

Checks

• [x] I've updated the changelog.
• [ ] I've tested this PR
• [x] This PR is for the develop branch not the stable branch.
• [x] This PR is complete and ready for review.

[update-docs[bot]]

Thanks for opening this pull request! Make sure CHANGELOG.md gets updated with this change, additionally any docs that need updated can be found at https://github.com/Varying-Vagrant-Vagrants/varyingvagrantvagrants.org

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