ansible/ius-repo: update link to IUS community repo r=zeid

This URL has been deprecated, since it was just redirecting
to the CDN backed URL.

See iusrepo/announce#18

Differential Revision: https://phabricator.services.mozilla.com/D76171

--HG--
extra : moz-landing-system : lando

ansible/roles/ius-repo/tasks/main.yml

@@ -1,5 +1,5 @@
 ---
 - name: configure IUS Community Repos
   yum:
-    name: https://centos7.iuscommunity.org/ius-release.rpm
+    name: https://repo.ius.io/ius-release-el7.rpm
     state: present