Extend DNS memory limit. 170Mi tents to OOM (#9084)

roles/kubernetes-apps/ansible/defaults/main.yml

 ---
 # Limits for coredns
-dns_memory_limit: 170Mi
+dns_memory_limit: 300Mi
 dns_cpu_requests: 100m
 dns_memory_requests: 70Mi
 dns_min_replicas: "{{ [ 2, groups['k8s_cluster'] | length ] | min }}"
@@ -16,7 +16,7 @@ coredns_default_zone_cache_block: |
 
 # nodelocaldns
 nodelocaldns_cpu_requests: 100m
-nodelocaldns_memory_limit: 170Mi
+nodelocaldns_memory_limit: 200Mi
 nodelocaldns_memory_requests: 70Mi
 nodelocaldns_ds_nodeselector: "kubernetes.io/os: linux"
 nodelocaldns_prometheus_port: 9253