Update K8S deploy files

Author: pierrehilbert

deploy/kubernetes/elastic-agent-managed-kubernetes.yaml

@@ -30,7 +30,7 @@ spec:
       dnsPolicy: ClusterFirstWithHostNet
       containers:
         - name: elastic-agent
-          image: docker.elastic.co/beats/elastic-agent:8.13.3
+          image: docker.elastic.co/beats/elastic-agent:8.13.4
           env:
             # Set to 1 for enrollment into Fleet server. If not set, Elastic Agent is run in standalone mode
             - name: FLEET_ENROLL

deploy/kubernetes/elastic-agent-standalone-kubernetes.yaml

@@ -704,7 +704,7 @@ spec:
       #        mountPath: /etc/elastic-agent/inputs.d
       containers:
         - name: elastic-agent-standalone
-          image: docker.elastic.co/beats/elastic-agent:8.13.3
+          image: docker.elastic.co/beats/elastic-agent:8.13.4
           args: ["-c", "/etc/elastic-agent/agent.yml", "-e"]
           env:
             # The basic authentication username used to connect to Elasticsearch