Update coredns to 1.11.3

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

Requires rancher/image-mirror#704

Closes #10718

manifests/coredns.yaml

@@ -120,7 +120,7 @@ spec:
               k8s-app: kube-dns
       containers:
       - name: coredns
-        image: "%{SYSTEM_DEFAULT_REGISTRY}%rancher/mirrored-coredns-coredns:1.10.1"
+        image: "%{SYSTEM_DEFAULT_REGISTRY}%rancher/mirrored-coredns-coredns:1.11.3"
         imagePullPolicy: IfNotPresent
         resources:
           limits: