dns/dnsmasq-devel: update to v2.92test18

CHANGELOG additions in upstream repo:

Change the behaviour of the DHVPv6 server when a REBIND message
is received but no lease exists. Under these circumstances a new
lease is created _only_ when the --dhcp-authoritative option is
set. This matches the behavior of the DHCPv4 server.

Add --dhcp-split-relay option. This makes a DHCPv4 relay which
is functional when client and server networks aren't mutually
route-able.

Detailed commit list:

v2.92test18 vs. test17, newest first, by Simon Kelley unless noted:

• c91c66e 2025-07-27 | Get destination address of received DHCPv4 packets right in dumpfile.
• fc9f698 2025-07-25 | Add --dhcp-split-relay option.
• ea5b0e6 2025-07-22 | Make DHCP6ADVERTISE messages RFC 8415 compliant.
• e775264 2025-07-22 | Fix wrong status in reply to DHCP6REQUEST.
• d976d94 2025-07-22 | Implement RFC 6221 para 4.
• 3034746 2025-07-22 | Allow --dhcp-authoritative to control recreation of missing leases in DHCPv6.
• 3ceea9e 2025-07-22 | Fix packet validation in DHCPv6.
• dfcef19 2025-02-11 | Added a tail to .hmtl files [Geert Stappers]

v2.92test17 vs. test16, newest first, by Simon Kelley:

• f74b74e 2025-07-06 | Refactor relay_reply6().
• c9342cb 2025-07-15 | Check for constructed name in --srv-host exceeding length limit.
• 2b844b8 2025-07-14 | Fix BNF from --srv-host in manpage.
• 65e9a89 2025-07-10 | Fix order of reads dhcp-hostsfile and /etc/ethers.
• da868a2 2025-07-08 | Restore bit-rotted warning about non-recursive upstreams.

MFH: 2025Q3
(cherry picked from commit 7e071233b59634f92f505e6da191dea4758760ed)