fix: mention that Node.js 13/15 support is dropped (fixes #9113)

[sapphi-red]

Description

Node.js 13 / 15 is already EOL and does not work with Vite 3. This was intended to drop but this was forgotten to mention.

fixes #9113

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[liana-p]

Thanks for adding this 👍