Update dependency DNSCrypt/dnscrypt-proxy to v2.1.15

[klutchell-renovate]

This PR contains the following updates:

Package	Update	Change
DNSCrypt/dnscrypt-proxy	patch	2.1.14 -> 2.1.15

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Release Notes

DNSCrypt/dnscrypt-proxy (DNSCrypt/dnscrypt-proxy)

v2.1.15

Compare Source

• The proxy now dynamically reduces timeouts as the connection limit is
  approached, improving performance and preventing connection exhaustion under
  heavy load.
• Fixed crashes in the configuration file watcher when fsnotify creation
  fails.
• DHCP resolver errors ($DHCP forwarding) are now properly logged and
  visible to system administrators.
• Fixed double-bracketing of IPv6 addresses in DoH stamps that could prevent
  proper connection to IPv6 DoH servers.
• Cache statistics are now more accurate by only counting queries that
  actually participate in caching.
• The monitoring UI has been enhanced with server health indicators and
  improved display of resolver performance metrics.
• Proxy hostnames (when using SOCKS/HTTP proxies) are now pre-resolved using
  bootstrap resolvers if they are domain names.
• Multiple IP addresses per hostname are now cached instead of randomly
  selecting one, improving connection reliability for multi-homed servers.

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