rebase: bump k8s.io/kubernetes from 1.23.5 to 1.23.6

Bumps [k8s.io/kubernetes](https://github.com/kubernetes/kubernetes) from 1.23.5 to 1.23.6.
- [Release notes](https://github.com/kubernetes/kubernetes/releases)
- [Commits](https://github.com/kubernetes/kubernetes/compare/v1.23.5...v1.23.6)

---
updated-dependencies:
- dependency-name: k8s.io/kubernetes
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Signed-off-by: Niels de Vos <ndevos@redhat.com>

vendor/k8s.io/client-go/kubernetes/clientset.go

@@ -413,6 +413,10 @@ func (c *Clientset) Discovery() discovery.DiscoveryInterface {
 func NewForConfig(c *rest.Config) (*Clientset, error) {
 	configShallowCopy := *c
 
+	if configShallowCopy.UserAgent == "" {
+		configShallowCopy.UserAgent = rest.DefaultKubernetesUserAgent()
+	}
+
 	// share the transport between all clients
 	httpClient, err := rest.HTTPClientFor(&configShallowCopy)
 	if err != nil {