caddy-estate v2.11.4-1

Caddy v2.11.4 + caddy-dns/cloudflare v0.2.4 + mholt/caddy-ratelimit v0.1.0.
Adds the rate_limit directive (L7 edge rate limiting) for guarding Kratos
/self-service/* against email-code request flooding. Build verified the
http.handlers.rate_limit module links.