[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/common/cmpv2Config/values.yaml b/kubernetes/common/cmpv2Config/values.yaml
index aeac990..9028608 100644
--- a/kubernetes/common/cmpv2Config/values.yaml
+++ b/kubernetes/common/cmpv2Config/values.yaml
@@ -35,5 +35,5 @@
       truststorePasswordSecretName: oom-cert-service-truststore-password
       truststorePasswordSecretKey: password
     certPostProcessor:
-      image: onap/org.onap.oom.platform.cert-service.oom-certservice-post-processor:2.5.0
+      image: onap/org.onap.oom.platform.cert-service.oom-certservice-post-processor:2.6.0