[ansible] move away from deprecated with_items for homebrew

ansible/roles/ruby/tasks/main.yml

@@ -1,10 +1,9 @@
 - name: install chruby
   homebrew:
-    name: "{{ item }}"
+    name:
-    state: present
-  with_items:
       - chruby
       - ruby-install
+    state: present
 
 - name: install Ruby
   command: /usr/local/bin/ruby-install ruby creates=~/.rubies/ruby-*