Used https://github.com/coredns/corefile-migration to
migrate the corefile. There are no changes for the
default file from 1.10.1 to 1.11.3.

Notable plugin changes include the k8s_external with fallthrough option
and rewrite with cname_target option.

These changes are not part of the default config that ships
with k3s. Customers using these two plugins can start using the new options

Metrics does not have any new features other than build tooling updates.

Requires https://github.com/rancher/image-mirror/pull/704Signed-off-by: Harsimran Singh Maan <maan.harry@gmail.com>
(cherry picked from commit 0b4d2497)
Signed-off-by: Brad Davidson <brad.davidson@rancher.com>