net/traefik: Update to upstream version 2.4.13.
Details:
- Bug and doc fixes, see: https://github.com/traefik/traefik/releases/tag/v2.4.13 https://github.com/traefik/traefik/releases/tag/v2.4.12
MFH: 2021Q3
(cherry picked from commit aa831f7ec98305daeea37669a7a46df20171c819)