Problem

The deploy workflow uses actions running on deprecated Node.js 20:

• actions/setup-node@v3 → upgrade to @v4
• peaceiris/actions-gh-pages@v3 → upgrade to @v4 or replace

Node.js 20 actions will be forced to Node.js 24 starting June 2, 2026. After that date, these actions may break.

Reference: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Proposed Solution

Update deploy.yml to use latest major versions of both actions.

Considerations

• Deadline is June 2, 2026
• Should be done alongside any other workflow changes (e.g., reordering steps per request-token-list - Deploy workflow blocked by branch protection on snapshot push #29)