test(pkgs_spec): update for new `opensuse` package

* https://travis-ci.com/saltstack-formulas/salt-formula/jobs/261961203#L1619-L1632

test/integration/v201902-py3/controls/pkgs_spec.rb

@@ -12,7 +12,7 @@ version =
   when 'fedora'
     '2019.2.1rc0-3.fc31'
   when 'suse'
-    '2019.2.0-lp151.5.3.1'
+    '2019.2.0-lp151.5.6.1'
   when 'debian'
     '2019.2.2+ds-1'
   end