ci: drop Node 20 from CI matrix

[jaysin586]

What

Removes Node 20 from the CI test matrix (node-version: [20, 22, 24] → [22, 24]) across every workflow that defines it (npm-publish.yml, coveralls.yml, and run-tests.yml where present).

Why

Node 20 is EOL and the pinned pnpm (via packageManager) no longer supports it — the Node 20 matrix leg fails at install with ERR_PNPM_UNSUPPORTED_ENGINE (seen on the svelte-purify publish run). Keeping 22 + 24 covers current LTS and current. The Coveralls gate that keys on Node 22 is unaffected.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: b000007f-7a92-4bf4-a731-a9ef48bfa43f

📥 Commits

Reviewing files that changed from the base of the PR and between 08353cc and dedc1c6.

📒 Files selected for processing (3)

• .github/workflows/coveralls.yml
• .github/workflows/npm-publish.yml
• .github/workflows/run-tests.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

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

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[jaysin586]

⏭️ NPM publishing was skipped due to the skip-publish label.