Using a deprecated Node version

[dkotter]

Describe the bug

In running this action on another repo, got the following error:

The following actions use a deprecated Node.js version and will be forced to run on node20: 10up/action-repo-automator@trunk

Everything seems to run fine but would be nice to fix this warning message.

Looks like we force Node v16 here: https://github.com/10up/action-repo-automator/blob/develop/action.yml#L82, wondering if we could bump that to v20

Steps to Reproduce

1. Run this Action in another repo
2. Take note of the warning that shows in the summary panel

Screenshots, screen recording, code snippet

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Environment information

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WordPress information

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Code of Conduct

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