ci: ignore k8s.io/kubernetes dependencies

These dependencies are pulled in by k8s.io/kubernetes with version
v0.0.0. It is therefore required to use 'replace' in go.mod to select a
compatible version of the additional k8s.io packages.

Dependabot does not seem to update packages listed in 'replace', only
under 'require'. That means, the version updates done by Dependabot do
not have any effect, as the contents is replaced with a different
version anyway. Ignoring these packages prevents the creation of
non-functional PRs.

Signed-off-by: Niels de Vos <ndevos@redhat.com>

.github/dependabot.yml

@@ -9,3 +9,30 @@ updates:
       - rebase
     commit-message:
       prefix: "rebase"
+    ignore:
+      # k8s.io/kubernetes prevents auto-updating these
+      - dependency-name: "k8s.io/api"
+      - dependency-name: "k8s.io/apiextensions-apiserver"
+      - dependency-name: "k8s.io/apimachinery"
+      - dependency-name: "k8s.io/apiserver"
+      - dependency-name: "k8s.io/cli-runtime"
+      - dependency-name: "k8s.io/client-go"
+      - dependency-name: "k8s.io/cloud-provider"
+      - dependency-name: "k8s.io/cluster-bootstrap"
+      - dependency-name: "k8s.io/code-generator"
+      - dependency-name: "k8s.io/component-base"
+      - dependency-name: "k8s.io/component-helpers"
+      - dependency-name: "k8s.io/controller-manager"
+      - dependency-name: "k8s.io/cri-api"
+      - dependency-name: "k8s.io/csi-translation-lib"
+      - dependency-name: "k8s.io/kube-aggregator"
+      - dependency-name: "k8s.io/kube-controller-manager"
+      - dependency-name: "k8s.io/kube-proxy"
+      - dependency-name: "k8s.io/kube-scheduler"
+      - dependency-name: "k8s.io/kubectl"
+      - dependency-name: "k8s.io/kubelet"
+      - dependency-name: "k8s.io/legacy-cloud-providers"
+      - dependency-name: "k8s.io/metrics"
+      - dependency-name: "k8s.io/mount-utils"
+      - dependency-name: "k8s.io/pod-security-admission"
+      - dependency-name: "k8s.io/sample-apiserver"