Merge pull request kubernetes#128668 from liggitt/externaljwt

Update staging docs to add externaljwt

Author: k8s-ci-robot

staging/README.md

@@ -23,6 +23,7 @@ Repositories currently staged here:
 - [`k8s.io/csi-translation-lib`](https://github.com/kubernetes/csi-translation-lib)
 - [`k8s.io/dynamic-resource-allocation`](https://github.com/kubernetes/dynamic-resource-allocation)
 - [`k8s.io/endpointslice`](https://github.com/kubernetes/endpointslice)
+- [`k8s.io/externaljwt`](https://github.com/kubernetes/externaljwt)
 - [`k8s.io/kms`](https://github.com/kubernetes/kms)
 - [`k8s.io/kube-aggregator`](https://github.com/kubernetes/kube-aggregator)
 - [`k8s.io/kube-controller-manager`](https://github.com/kubernetes/kube-controller-manager)