Remove containerd_config assert

This assert is present since 2021, we can assume now users have removed
it from their inventories.

roles/kubernetes/preinstall/tasks/0040-verify-settings.yml

@@ -273,14 +273,6 @@
     - containerd_version not in ['latest', 'edge', 'stable']
     - container_manager == 'containerd'
 
-- name: Stop if using deprecated containerd_config variable
-  assert:
-    that: containerd_config is not defined
-    msg: "Variable containerd_config is now deprecated. See https://github.com/kubernetes-sigs/kubespray/blob/master/inventory/sample/group_vars/all/containerd.yml for details."
-  when:
-    - containerd_config is defined
-    - not ignore_assert_errors
-
 - name: Stop if auto_renew_certificates is enabled when certificates are managed externally (kube_external_ca_mode is true)
   assert:
     that: not auto_renew_certificates