CVE-2023-5517: fix a flaw causing named to crash with an assertion failure when
nxdomain-redirect is set, and a PTR query for an RFC 1918 address returns NXDOMAIN
CVE-2023-5679: fix a crash in named due to an assertion failure during recursive
resolution when both DNS64 and serve-stale are enabled
CVE-2023-6516: fix a vulnerability where named may exceed max-cache-size
due to unbounded growth of queued cache cleanup events