Upgrade to Node.js 20/npm 10

[jakewrfoster]

Description

Now that node 20 is LTS, and NPM 10 is bundled with both node 18 and node 20, we should support both explicitly.

Acceptance Criteria

• Bump the version of node to 20 and npm to 10 in tests
• Modify package.json files to explicitly declare support for Node 20 and NPM 10
• Cut new releases as necessary

Use Case

As a developer, I want to be able to use these packages in a project that is using node 20 and/or npm 10.

[jakewrfoster]

Doesn't use Node.