ci(codex): bump public-workflows pin to v2.4.0

[nsportsman]

Bumps the Codex PR reviewer pin to v2.4.0 (f7fb4810).

Why: this repo was pinned to a pre-fix public-workflows version (v2.1.0 / v2.3.1) where Harden-Runner's disable-sudo-and-containers pre-disables sudo on the codex job. openai/codex-action needs sudo to lock its proxy file before it irreversibly drops sudo, so the action exits 1 before any review runs — the Codex review silently fails on every real code PR. (Green checks on docs/release-only PRs are preflight-skips, which masked this.)

Fixed upstream in praetorian-inc/public-workflows#80, released in v2.4.0 (also carries the gpt-5.5 default + CVE-2025-32955 container-lockdown hardening).

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 97dd6791-cd84-49ce-ac57-a330443ef731

📥 Commits

Reviewing files that changed from the base of the PR and between 4c719fd and 9fd2bd1.

📒 Files selected for processing (1)

• .github/workflows/codex-code.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/bump-codex-pin-v2.4.0

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[github-actions]

Gemini review skipped — non-code PR (only changed files matching docs/**, .github/**, .claude-plugin/**, *.md, *.txt, images, or license-like files). Post @gemini on a review comment to force a review.

[github-actions]

Codex review skipped — non-code PR (only changed files matching docs/**, .github/**, .claude-plugin/**, *.md, *.txt, images, or license-like files). Post @codex on a review comment to force a review.