HAProxy: 3.3.17 → 3.4.1

Upgrade impact: Minor upgrade. Minor releases are usually backwards-compatible, but can add or change behaviour — test in staging before production.

Fixed by upgrading to 3.4.1 iVulnerabilities that affect 3.3.17 but no longer affect 3.4.1 — the security gain from this upgrade, by exploited status then exploitation probability.

Exploited first, then by exploitation probability (EPSS).