Merge branch 'sh-bump-rugged-0.27.4' into 'master'

Bump rugged to 0.27.4 for security fixes

See merge request gitlab-org/gitlab-ce!21170

Gemfile.lock

@@ -810,7 +810,7 @@ GEM
     rubyzip (1.2.1)
     rufus-scheduler (3.4.0)
       et-orbi (~> 1.0)
-    rugged (0.27.2)
+    rugged (0.27.4)
     safe_yaml (1.0.4)
     sanitize (4.6.6)
       crass (~> 1.0.2)

changelogs/unreleased/sh-bump-rugged-0-27-4.yml

+---
+title: Bump rugged to 0.27.4 for security fixes
+merge_request:
+author:
+type: security