Fixes the following security issue: - CVE-2021-25217: A buffer overrun in lease file parsing code can be used to exploit a common vulnerability shared by dhcpd and dhclient For details, see the advisory: https://kb.isc.org/docs/cve-2021-25217 Update the LICENSE hash for a change of copyright years. Signed-off-by: Peter Korsgaard <peter@korsgaard.com>