Update Rust client library from clux/kube-rs to kube-rs/kube

The Rust client library's URL redirects to a new location.  This change updates the URL to match where it redirects.

Old URL: https://github.com/clux/kube-rs
New URL: https://github.com/kube-rs/kube

Author: brianpursley

content/en/docs/reference/using-api/client-libraries.md

@@ -77,7 +77,7 @@ their authors, not the Kubernetes team.
 | Ruby                 | [github.com/abonas/kubeclient](https://github.com/abonas/kubeclient) |
 | Ruby                 | [github.com/k8s-ruby/k8s-ruby](https://github.com/k8s-ruby/k8s-ruby) |
 | Ruby                 | [github.com/kontena/k8s-client](https://github.com/kontena/k8s-client) |
-| Rust                 | [github.com/clux/kube-rs](https://github.com/clux/kube-rs) |
+| Rust                 | [github.com/kube-rs/kube](https://github.com/kube-rs/kube) |
 | Rust                 | [github.com/ynqa/kubernetes-rust](https://github.com/ynqa/kubernetes-rust) |
 | Scala                | [github.com/hagay3/skuber](https://github.com/hagay3/skuber) |
 | Scala                | [github.com/hnaderi/scala-k8s](https://github.com/hnaderi/scala-k8s) |