build(deps): bump traefik in /compose/production/traefik

Bumps traefik from 3.1.5 to 3.1.6.

---
updated-dependencies:
- dependency-name: traefik
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

compose/production/traefik/Dockerfile

@@ -1,4 +1,4 @@
-FROM traefik:3.1.5
+FROM traefik:3.1.6
 RUN mkdir -p /etc/traefik/acme \
   && touch /etc/traefik/acme/acme.json \
   && chmod 600 /etc/traefik/acme/acme.json