Log Message:
Update to dhcpcd-10.0.8 with the following changes:

* DHCP: use request_time, fallback_time and ipv4ll_time rather than reboot timeout
* DHCP6: Wait for IRT to elapse before requesting advertisments
* DHCPv6: Don't re-INFORM if the RA changes
* privsep: Reduce fd use
* dhcpcd: Add support for arp persist defence
* Move dhcp(v4) packet size check earlier
* Define the Azure Endpoint and other site-specific options
* add RFC4191 support by @goertzenator in #297
* dhcpcd: Respect IPV6_PREFERRED_ONLY flag regardless of state
* Fix time_offset to be int to match RFC-2132
* hooks/30-hostname: Exit with 0 if setting hostname is not needed