chore(ci): bump actions for Node 24 runtime

[nabobery]

Summary

Bumps GitHub Actions to versions compatible with the Node 24 runtime, and removes the hardcoded node-version: 20 pin.

Change	Before	After
actions/checkout	v4	v6
actions/setup-node	v4	v6
node-version pin	20 (hardcoded)	removed (uses project default)

Test plan

• Verify lint workflow runs successfully on next PR

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Project	Deployment	Actions	Updated (UTC)
project-protico	Ready	Preview, Comment	Apr 26, 2026 0:23am

[coderabbitai]

Walkthrough

Bumped actions/checkout and actions/setup-node from v4 to v6 in the lint workflow; the explicit node-version: 20 setting was removed while npm install and npm run lint remain unchanged.

Changes

Cohort / File(s)	Summary
GitHub Actions Workflow Updates .github/workflows/lint.yml	Updated action versions: actions/checkout@v4 → actions/checkout@v6, actions/setup-node@v4 → actions/setup-node@v6. Removed explicit node-version: 20 from the actions/setup-node step; subsequent npm install and npm run lint unchanged.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 I hopped through YAML lines tonight,
Pushed versions up with gentle bite,
No node tag now, just cleaner skies,
Lint will run where action flies! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: bumping GitHub Actions versions for Node 24 runtime compatibility, which aligns with the actual updates to checkout and setup-node actions.
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.
Description check	✅ Passed	The PR description clearly relates to the changeset, detailing the upgrade of GitHub Actions versions (checkout and setup-node from v4 to v6) and removal of the hardcoded Node 20 pin.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/bump-actions-node24

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