Merge branch 'upgrade_cert-manager' into 'master'

Upgrade to cert-maanger chart v1.3.1

See merge request openappstack/openappstack!390

flux/cert-manager/cert-manager_hr.yaml

@@ -12,7 +12,7 @@ spec:
     # https://artifacthub.io/packages/helm/jetstack/cert-manager
     repository: https://charts.jetstack.io
     name: cert-manager
-    version: 1.1.0
+    version: 1.3.1
   valuesFrom:
     - secretKeyRef:
         name: cert-manager-settings