Move kube_version var to defaults

Move the variable kube_version to defaults to have the possibility to overwrite it via group_vars inventory if needed.

roles/uploads/tasks/main.yml

@@ -1,6 +1,4 @@
 ---
-- include_vars: "kube_versions.yml"
-
 - name: Create dest directories
   file: path={{local_release_dir}}/{{item.dest|dirname}} state=directory recurse=yes
   with_items: '{{downloads}}'