Update caddy-docker-proxy version to v2.12.0

[github-actions]

Update caddy-docker-proxy from upstream

Update Dockerfile ARG CDP_VERSION

changed lines [3] of file "rootfs/Dockerfile"

v2.12.0

## What's Changed
* Bump github.com/caddyserver/caddy/v2 from 2.11.1 to 2.11.2 by @dependabot[bot] in https://github.com/lucaslorentz/caddy-docker-proxy/pull/779
* Move IngressNetworksMap log message level from info to debug. by @jum in https://github.com/lucaslorentz/caddy-docker-proxy/pull/777
* Fix admin off regression from PR #775 by @lucaslorentz in https://github.com/lucaslorentz/caddy-docker-proxy/pull/781
* Fix test expectations after IngressNetworksMap log level change by @lucaslorentz in https://github.com/lucaslorentz/caddy-docker-proxy/pull/782
* Add sprig template functions to label templates by @lucaslorentz in https://github.com/lucaslorentz/caddy-docker-proxy/pull/783
* Support escaping dots in label keys with \. by @lucaslorentz in https://github.com/lucaslorentz/caddy-docker-proxy/pull/784
* Document and log the Caddyfile autosave path by @lucaslorentz in https://github.com/lucaslorentz/caddy-docker-proxy/pull/785

## New Contributors
* @jum made their first contribution in https://github.com/lucaslorentz/caddy-docker-proxy/pull/777

**Full Changelog**: https://github.com/lucaslorentz/caddy-docker-proxy/compare/v2.11.0...v2.12.0

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