fix: handlers to enforce sysctl reload

tasks/main.yml

@@ -2,3 +2,4 @@
 - include_tasks: kernel.yml
 - include_tasks: coredump.yml
   when: not (kernel_coredump_enabled | bool)
+- include_tasks: post.yml

tasks/post.yml

@@ -0,0 +1,3 @@
+---
+- name: Flush handlers to enforce sysctl reload
+  meta: flush_handlers