pdb: update labels to match StatefulSet (#7)

Author: bendrucker

templates/server-disruptionbudget.yaml

@@ -16,7 +16,7 @@ spec:
   maxUnavailable: {{ template "vault.pdb.maxUnavailable" . }}
   selector:
     matchLabels:
-      app: {{ template "vault.name" . }}
-      release: "{{ .Release.Name }}"
+      app.kubernetes.io/name: {{ template "vault.name" . }}
+      app.kubernetes.io/instance: {{ .Release.Name }}
       component: server
 {{- end -}}