net/traefik: Update to upstream version 2.8.3

Details:

• Bugfixes, see https://github.com/traefik/traefik/releases/tag/v2.8.3
• In rare occasions, updating config files may be necessary, see https://doc.traefik.io/traefik/migration/v2/#v282

MFH: 2022Q3
(cherry picked from commit 728a9f96798fb925240ba18defe2c377b00bc231)