Invoking "yum" only once while using a loop via squash_actions is deprecated

[sbesson]

TASK [ome.upgrade_distpackages : system packages | upgrade] *****************************************************************************************
[DEPRECATION WARNING]: Invoking "yum" only once while using a loop via squash_actions is deprecated. Instead of using a loop to supply multiple 
items and specifying `name: "{{ item }}"`, please use `name: '{{ upgrade_distpackages }}'` and remove the loop. This feature will be removed in 
version 2.11. Deprecation warnings can be disabled by setting deprecation_warnings=False in ansible.cfg.