fix: bump ACM operator channel to release-2.16 (#151)

release-2.15 is not available in the OCP 4.22 operator catalog.
release-2.16 supports OCP 4.19, 4.20 (EUS), and 4.21+.

Signed-off-by: Min Zhang <minzhang@redhat.com>

Author: minmzzhang

values-hub.yaml

@@ -115,7 +115,7 @@ clusterGroup:
     acm:
       name: advanced-cluster-management
       namespace: open-cluster-management
-      channel: release-2.15
+      channel: release-2.16
       catalogSource: redhat-operators
     eso:
       name: openshift-external-secrets-operator