Update cilium minimum kernel preinstall check (#6376)

Signed-off-by: Arthur Outhenin-Chalandre <arthur@cri.epita.fr>

roles/kubernetes/preinstall/tasks/0020-verify-settings.yml

@@ -128,7 +128,7 @@
 
 - name: Stop if kernel version is too low
   assert:
-    that: ansible_kernel.split('-')[0] is version('4.8', '>=')
+    that: ansible_kernel.split('-')[0] is version('4.9.17', '>=')
   when:
     - kube_network_plugin == 'cilium'
     - not ignore_assert_errors