[BR] `gcr.io/kubebuilder/kube-rbac-proxy` image is not available anymore

[eliottness]

Describe the bug

The gcr.io/kubebuilder/kube-rbac-proxy image was deprecated early this year and removed yesterday. Now the operator pod does not start anymore cc @kubealex

To Reproduce
Steps to reproduce the behavior:

• Install the project

The operator is put in ImagePullBackOff directly

Expected behavior

The project needs to use another image for this or needs to migrate to the new way to do this in kubebuilder.
There is an example of what to do here: splunk/splunk-operator#1418