cert-manager: 1.20.3 -> 1.21.0

Change-Id: I50161b8cfd621c1b07de87358fe8c14d1b14f711
diff --git a/charts/cert-manager/templates/servicemonitor.yaml b/charts/cert-manager/templates/servicemonitor.yaml
index 76f358f..a33df0b 100644
--- a/charts/cert-manager/templates/servicemonitor.yaml
+++ b/charts/cert-manager/templates/servicemonitor.yaml
@@ -54,8 +54,8 @@
       - {{ include "cert-manager.namespace" . }}
 {{- end }}
   endpoints:
-  - targetPort: {{ .Values.prometheus.servicemonitor.targetPort }}
-    path: {{ .Values.prometheus.servicemonitor.path }}
+  - targetPort: http-metrics
+    path: /metrics
     {{- if .Values.prometheus.servicemonitor.interval }}
     interval: {{ .Values.prometheus.servicemonitor.interval }}
     {{- end }}