dhcpcd: upgrade 10.0.6 -> 10.0.8

dhcpcd: upgrade 10.0.6 -> 10.0.8

Changelog (https://github.com/NetworkConfiguration/dhcpcd/releases):

10.0.8:
- Fixed compile without ARP
- Fixed closefrom test for glibc
- Fixed spelling of ADVERTISEMENT

10.0.7:
- 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 by @pradeep-brightsign in #273
- Move dhcp(v4) packet size check earlier by @pemensik in #295
- Define the Azure Endpoint and other site-specific options by @lparkes in #299
- add RFC4191 support by @goertzenator in #297
- dhcpcd: Respect IPV6_PREFERRED_ONLY flag regardless of state by @taoyl-g in #307
- Fix time_offset to be int to match RFC-2132 by @ColinMcInnes in #319
- hooks/30-hostname: Exit with 0 if setting hostname is not needed by @bdrung in #320

Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>