net/traefik: Update to upstream release 2.11.3

Details:
- Bugfix release, see
  https://github.com/traefik/traefik/releases/tag/v2.11.3
- The website lists CVE-2024-24788 as security reference, but this is
  not a vulnerability in traefik itself, but in the Go stdlib, which
  was fixed in Go 1.22.3.

MFH:		2024Q2
Security:	CVE-2024-24788