Drop Node.js 20 support

[gr2m]

Node.js 20 reaches end of maintenance on April 30, 2026. We should drop support for it and require Node.js 22+.

See the Node.js release schedule for details.

Tasks

• Update engines field in all published package.json files
• Update CI matrix to remove Node.js 20
• Update documentation referencing supported Node.js versions

[gr2m]

that's done

[lgrammel]

Identify issue type

Identified as None
Confidence: High

Rationale

This is a completed repository maintenance/chore task rather than a bug report, product feature request, standalone documentation request, or examples request.

Evidence

• The issue is a maintenance checklist to update package engines, CI, and documentation after Node.js 20 reached end of maintenance.
• The only comment states that the work is done.