Fix deprecation warnings

https://docs.ansible.com/ansible/devel/porting_guides/porting_guide_2.7.html#using-a-loop-on-a-package-module-via-squash-actions

tasks/main.yml

@@ -13,11 +13,10 @@
 
 - name: install required packages
   yum:
-    name: "{{item}}"
+    name:
+      - bzip2
+      - sudo
     state: present
-  with_items:
-    - bzip2
-    - sudo
 
 - name: create conda user
   user: