net/traefik: Update to upstream version 3.7.11
Details:
- Multiple bug- and security fixes, see https://github.com/traefik/traefik/releases/tag/v3.7.11
- No breaking config changes
MFH: 2026Q3
Security: https://github.com/traefik/traefik/security/advisories/GHSA-5w68-77r2-r64c
https://github.com/traefik/traefik/security/advisories/GHSA-g55h-rg46-x9c5 https://github.com/traefik/traefik/security/advisories/GHSA-j994-9gqj-9hwq https://github.com/traefik/traefik/security/advisories/GHSA-m6wx-622r-48r9