cert-manager: upgrade from 1.12.17 to 1.17.4

Change-Id: Iea0d6eac22a57f9f1fc522e6abdd9359fbbd1415
diff --git a/charts/cert-manager/templates/networkpolicy-webhooks.yaml b/charts/cert-manager/templates/networkpolicy-webhooks.yaml
index 349877a..3a0ed7a 100644
--- a/charts/cert-manager/templates/networkpolicy-webhooks.yaml
+++ b/charts/cert-manager/templates/networkpolicy-webhooks.yaml
@@ -12,13 +12,9 @@
     {{- end }}
   podSelector:
     matchLabels:
-        app: {{ include "webhook.name" . }}
-        app.kubernetes.io/name: {{ include "webhook.name" . }}
-        app.kubernetes.io/instance: {{ .Release.Name }}
-        app.kubernetes.io/component: "webhook"
-        {{- with .Values.webhook.podLabels }}
-        {{- toYaml . | nindent 6 }}
-        {{- end }}
+      app.kubernetes.io/name: {{ include "webhook.name" . }}
+      app.kubernetes.io/instance: {{ .Release.Name }}
+      app.kubernetes.io/component: "webhook"
   policyTypes:
   - Ingress