dns/dnsmasq: Update 2.92 => 2.92rel2 (6 CVEs)

Including privilege escalation, cache poisoning/rediction, information
leak, and denial of service.

See https://www.kb.cert.org/vuls/id/471747
See https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html

PR: 295204
Security: eeb4d69a-4d74-11f1-9a9c-994b98c88011
Security: CVE-2026-2291
Security: CVE-2026-4890
Security: CVE-2026-4891
Security: CVE-2026-4892
Security: CVE-2026-4893
Security: CVE-2026-5172
Sponsored by: UNIS Labs
MFH: 2026Q2