Remove unnecessary update_cache directive / CentOS

We've just updated it in the task above, so it's unnecessary

roles/matrix-base/tasks/server_base/setup_centos.yml

@@ -32,5 +32,4 @@
     name:
       - "{{ matrix_docker_package_name }}"
     state: latest
-    update_cache: yes
   when: matrix_docker_installation_enabled|bool