Update caddy-docker-proxy version to v2.12.1

[github-actions]

Update caddy-docker-proxy from upstream

Update Dockerfile ARG CDP_VERSION

changed lines [14] of file "rootfs/Dockerfile"

v2.12.1

## What's Changed
* Move "no tasks in running state" log to debug level by @lucaslorentz in https://github.com/lucaslorentz/caddy-docker-proxy/pull/786
* Fix "Caddy ContainerID" log spam by @jjlin in https://github.com/lucaslorentz/caddy-docker-proxy/pull/787
* Feat/build in docker by @jriberg in https://github.com/lucaslorentz/caddy-docker-proxy/pull/776
* docs: unify CLI flags and env vars into a single table by @lucaslorentz in https://github.com/lucaslorentz/caddy-docker-proxy/pull/792
* ci: stabilize docker tests and bump deprecated actions by @lucaslorentz in https://github.com/lucaslorentz/caddy-docker-proxy/pull/795
* Bump go.uber.org/zap from 1.27.1 to 1.28.0 by @dependabot[bot] in https://github.com/lucaslorentz/caddy-docker-proxy/pull/797
* Bump github.com/caddyserver/caddy/v2 from 2.11.2 to 2.11.3 by @dependabot[bot] in https://github.com/lucaslorentz/caddy-docker-proxy/pull/799
* fix: continue past per-client TaskList errors in multi-socket mode by @boin in https://github.com/lucaslorentz/caddy-docker-proxy/pull/802

## New Contributors
* @jjlin made their first contribution in https://github.com/lucaslorentz/caddy-docker-proxy/pull/787
* @boin made their first contribution in https://github.com/lucaslorentz/caddy-docker-proxy/pull/802

**Full Changelog**: https://github.com/lucaslorentz/caddy-docker-proxy/compare/v2.12.0...v2.12.1

GitHub Action workflow link

---

Created automatically by Updatecli Options: Most of Updatecli configuration is done via its manifest(s). If you close this pull request, Updatecli will automatically reopen it, the next time it runs. If you close this pull request and delete the base branch, Updatecli will automatically recreate it, erasing all previous commits made. Feel free to report any issues at github.com/updatecli/updatecli. If you find this tool useful, do not hesitate to star our GitHub repository as a sign of appreciation, and/or to tell us directly on our chat!