Update varnish/init.sls

varnish/init.sls

@@ -8,14 +8,14 @@ varnish:
     - key_url: https://packagecloud.io/varnishcache/varnish72/gpgkey
     - file: /etc/apt/sources.list.d/varnish.list
     - clean_file: true
-  pkg.installed:
+  pkg.latest:
     - pkgs:
       - varnish
       - varnish-dev
       - python3-docutils # For building modules
-    - version: '7.2.*'
     - require:
         - pkgrepo: varnish
+    - refresh: True
   service.running:
     - enable: True
     - require: