[PLATFROM] Update cert-manager release to 2.6.0

Update libraries to fix vulnerabilities

Issue-ID: OOM-2985

Signed-off-by: Andreas Geissler <andreas-geissler@telekom.de>
Change-Id: I8ac4a769a791ffb90dfd57358dd839c7a631c403
diff --git a/kubernetes/platform/components/cmpv2-cert-provider/values.yaml b/kubernetes/platform/components/cmpv2-cert-provider/values.yaml
index f05fbe1..e387cc8 100644
--- a/kubernetes/platform/components/cmpv2-cert-provider/values.yaml
+++ b/kubernetes/platform/components/cmpv2-cert-provider/values.yaml
@@ -28,7 +28,7 @@
 # Deployment configuration
 deployment:
   name: oom-certservice-cmpv2issuer
-  image: onap/org.onap.oom.platform.cert-service.oom-certservice-k8s-external-provider:2.5.0
+  image: onap/org.onap.oom.platform.cert-service.oom-certservice-k8s-external-provider:2.6.0
   proxyImage: gcr.io/kubebuilder/kube-rbac-proxy:v0.4.0
   # fol local development use IfNotPresent
   pullPolicy: Always