chore(deps): update rancher/mirrored-coredns-coredns docker tag to v1.12.4

Author: renovate[bot]

kube-system/dnsmasq/coredns.yaml

@@ -121,7 +121,7 @@ spec:
         kubernetes.io/os: linux
       containers:
       - name: coredns
-        image: rancher/mirrored-coredns-coredns:1.12.3
+        image: rancher/mirrored-coredns-coredns:1.12.4
         imagePullPolicy: IfNotPresent
         resources:
           limits: