net/traefik: Update to upstream release 2.10.6

Details:

• Bugfix release, see https://github.com/traefik/traefik/releases/tag/v2.10.6
• Note that above link mentions two CVEs. The CVEs are not related to traefik itself but are fixes in the Go standard library. The FreeBSD port receives the fixes by building traefik against an updated revision of lang/go121

MFH: 2023Q4
(cherry picked from commit 59b5af61386520bf4abc09a1090d46c4fb920c88)