CVE-2026-53624 Fiber: HSTS header never set in helmet middleware due to incorrect protocol check

Fiber is an Express inspired web framework written in Go. Prior to 3.4.0, the helmet middleware in middleware/helmet/helmet.go never sets the Strict-Transport-Security response header even when HSTSMaxAge is configured because it checks c.Protocol for https instead of c.Scheme. This issue is fixe...