Replace deprecated method use for CR v0.15.0

This change replaces deprecated method usage with the new standards
defined by controller-runtime v0.15.0.

The changes are noted in the release notes:
https://github.com/kubernetes-sigs/controller-runtime/releases/tag/v0.15.0

Specifically we are changing:
    1. Usage of options.Namespace replaced by options.Cache.Namespaces
    2. Usage of MultiNamespacedCacheBuilder replaced by
       options.Cache{Namespaces} struct.
    3. wait.ErrWaitTimeout replaced by wait.Interrupted(err)

Signed-off-by: Brendan Shephard <bshephar@redhat.com>

pkg/plugins/hybrid/v1alpha/scaffolds/init.go

@@ -33,11 +33,7 @@ import (
 	"sigs.k8s.io/kubebuilder/v3/pkg/plugins"
 
 	kustomizev2 "sigs.k8s.io/kubebuilder/v3/pkg/plugins/common/kustomize/v2"
-<<<<<<< HEAD
 	golangv4 "sigs.k8s.io/kubebuilder/v3/pkg/plugins/golang/v4/scaffolds"
-=======
-	golangv3 "sigs.k8s.io/kubebuilder/v3/pkg/plugins/golang/v3/scaffolds"
->>>>>>> 6410ccf (Bump controller-runtime and k8s.io deps)
 )
 
 const (