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dnsmasq: update DNS records after pruning DHCP leases

Erik Karlsson requested to merge erik-dnsmasq-update-dns-after-lease-prune-backport into release-7.3

Not doing so can result in a use after free since the name for DHCP derived DNS records is represented as a pointer into the DHCP lease table. Update will only happen when necessary since lease_update_dns tests internally on dns_dirty and the force argument is zero.

(cherry picked from commit e1f41c7b)

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