Attention: os-caddy-2.0.0 will remove DNS Providers (except Cloudflare)

[Monviech (Cedrik)]

Please plan the update accordingly when installing 25.1.7 when it comes out.
os-caddy will update to 2.0.0 and will remove the DNS Provider subsystem, except Cloudflare.

Here are the notes and references:

https://github.com/opnsense/plugins/blob/a5fdb9ccd1ccdf885156a702cda8920f08bb16fd/www/caddy/pkg-descr#L9-L21

Here is the why:

https://github.com/opnsense/plugins/issues/4690

I spent quite some time on possible solutions, like building a plugin around xcaddy, but it all ended in being simply unmaintainable.