Bump cluster-dns-operator to Kubernetes 1.28 for 4.15

Description of problem

The cluster-dns-operator repository vendors k8s.io/* v0.27.2 and controller-runtime v0.15.0. OpenShift 4.15 is based on Kubernetes 1.28.

Version-Release number of selected component (if applicable)

4.15.

How reproducible

Always.

Steps to Reproduce

Check https://github.com/openshift/cluster-dns-operator/blob/release-4.15/go.mod.

Actual results

The k8s.io/* packages are at v0.27.2, and the sigs.k8s.io/controller-runtime package is at v0.15.0.

Expected results

The k8s.io/* packages are at v0.28.0 or newer, and the sigs.k8s.io/controller-runtime package is at v0.16.0 or newer.

Additional info

The controller-runtime v0.16 release includes some breaking changes; see the release notes at https://github.com/kubernetes-sigs/controller-runtime/releases/tag/v0.16.0.