[ru] update labs link

Author: Arhell

content/ru/includes/task-tutorial-prereqs.md

@@ -5,4 +5,4 @@
 или вы можете использовать одну из песочниц Kubernetes:
 
 * [Killercoda](https://killercoda.com/playgrounds/scenario/kubernetes)
-* [Play with Kubernetes](http://labs.play-with-k8s.com/)
+* [Play with Kubernetes](https://labs.play-with-k8s.com/)