www/caddy: upgrade 1.0.4 -> 2.1.1

• previous version was deprecated by upstream
• submitter becomes maintainer

PR: 246623
Submitted by: daniel.tihanyi@tetragir.com
Reviewed by: basil.hendroff@gmail.com, dan@familybrown.org
Approved by: fabian.freyer@physik.tu-berlin.de (maintainer timeout)
Relnotes: https://caddyserver.com/v2