Remove bundle-audit ignores that are no longer applicable

.gitlab-ci.yml

@@ -300,7 +300,7 @@ bundler:audit:
     - master@gitlab/gitlabhq
     - master@gitlab/gitlab-ee
   script:
-    - "bundle exec bundle-audit check --update --ignore OSVDB-115941 CVE-2016-6316 CVE-2016-6317"
+    - "bundle exec bundle-audit check --update"
 migration paths:
   stage: test