odhcpd: update to Git HEAD (2025-08-26)

odhcpd: update to Git HEAD (2025-08-26)

2859741d971e dhcpv4: store reqopts as uint8_t
6d342cc03bf7 odhcpd: add DNR (RFC 9463) support
c89b8b3f2ff3 odhcpd: make the IPv6 RA DNR lifetime configurable
066b3dc6ec1a netlink: fix a memory leak
171140e90b6a odhcpd: add a helper function for addr6/prefix parsing
5585b969c18f router: move pref64 calculations to the config stage
4308384748be dhcpv6: add ipv6 pxe support
6e1ad492cef5 router: replace ssize_t with size_t

Signed-off-by: David Härdeman <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/20022
Signed-off-by: Robert Marko <[email protected]>