Bump GitHub Actions to v6 (Node 24 runtime)

[Fl0p]

Summary

• Bumps actions/checkout, pnpm/action-setup, and actions/setup-node from v4 to v6
• All three v6 releases ship with using: node24 in their action.yml, replacing the deprecated node20 runtime
• Addresses GitHub's Node 20 deprecation ahead of the 2026-06-02 forced migration deadline (Node 20 removed from runners 2026-09-16)

Verification

Confirmed each v6 action uses node24 via the GitHub API:

• actions/checkout@v6.0.2 — using: node24
• actions/setup-node@v6.4.0 — using: node24
• pnpm/action-setup@v6.0.8 — using: node24

Test plan

• Deploy workflow runs green on merge to main
• No Node.js 20 deprecation annotation in the run log

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 45b2d965-00fa-4a9e-9713-d65037479eb0

📥 Commits

Reviewing files that changed from the base of the PR and between 958658a and 23b3009.

📒 Files selected for processing (1)

• .github/workflows/deploy.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch flo-169-actions-node24

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