chore: Update engine requirement

[chefjackson]

nodejs/node#51118
https://github.com/nodejs/node/releases/tag/v18.20.0

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PR-Codex overview

This PR updates the minimum required Node version to >=18.20.0.

Detailed summary

• Updated the minimum required Node version in package.json from >=18.0.0 to >=18.20.0.

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Latest commit: f32ac3b

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