Don't run tests on unsupported k8s client versions
Don't run tests on unsupported k8s client versions

Our setup.py requests a minimum of kubernetes client
10.1, but our CI was testing version 9 and 10. Due to
the newer, stricter resolver in pip 20.3, this fails
installation.

We remove the matrix here.

yuvipanda/jupyterhub-kubernetes-spawner,jupyterhub/kubespawner