odhcp6c: update to Git HEAD (2025-11-24)

odhcp6c: update to Git HEAD (2025-11-24)

f98b6ec82362 all: implement RFC8910 §3 URI equality check
3484787e9a5b all: implement RFC8910 captive portal (CP) option
25a0c40580f9 dhcpv6: refactor variable names
165bcc68ef2b dhcpv6: refactor variable names
8f60e7b1833c dhcpv6: refactor variable names
319305fceeef dhcpv6: refactor variable names
dcb53c496513 dhcpv6: assign a new field for prefix exclusion length
080b64d70e73 dhcpv6: refactor variable names
66dd9b26b73a dhcpv6: refactor variable names
f038a50604ae odhcp6c: set environment script to its current location
5f63e7e47dfc github: ci: add MIPS64, PowerPC64 and RISCV64
038407eca8a4 dhcpv6: restart DHCPv6 on receipt of RA containing a new prefix
af9968c0293f dhcpv6: fix processing PIO exclusion loop variable collision
5492f09ec075 odhcp6c: apply draft-ietf-6man-slaac-renum-11 lifetime rules
38a31eb29a48 src: add fallthrough attribute
b46d79c8792c odhcp6c: properly guard attributes

https://github.com/openwrt/odhcp6c/compare/cbc8ff0e6226...f98b6ec82362

Signed-off-by: Álvaro Fernández Rojas <[email protected]>