Removed Node 20 from CI matrix

[cmraible]

no refs

Summary

• remove Node 20 from the CI test matrix
• retain Node 22 and the Dockerfile-selected Node version

Why?

This repo is only published as a container image, so we control the node version in the public distribution. We only publish a Node 22 container, so we shouldn't need to run tests in Node 20 anymore.

[coderabbitai]

Walkthrough

The CI Node.js matrix now includes Node 22 and the extracted Dockerfile version. It no longer includes Node 20. Duplicate removal remains enabled.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly states the main change: removing Node 20 from the CI matrix.
Description check	✅ Passed	The description directly explains the removal of Node 20 and the retained Node 22 and Dockerfile-selected versions.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/remove-node-20-ci

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[cmraible]

Note: we'll need to remove the Node 20 ruleset from the branch protection rules before we can merge this.

[JoeeGrigg]

Seems reasonable to me