Update to Node 20

[AaronFeledy]

Updates Node version requirements:

• .node-version: 18 → 20
• package.json engines: >=18 → >=20

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Note

Standardizes the project on Node 20 for builds and CI.

• Sets Node engine to >=20.0.0 in package.json and package-lock.json; updates .node-version to 20
• Updates GitHub Actions workflows (pr-docs-tests.yml, pr-linter.yml, pr-ruby-tests.yml, pr-unit-tests.yml) to use Node 20
• Adds unreleased CHANGELOG entry noting Node 20 update

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