Merge branch 'bump_gitlab_git' into 'master'

Bump gitlab git

Fixes #1394

See merge request !1015

Gemfile.lock

@@ -179,12 +179,12 @@ GEM
       mime-types (~> 1.19)
     gitlab_emoji (0.0.1.1)
       emoji (~> 1.0.1)
-    gitlab_git (6.1.0)
+    gitlab_git (6.2.1)
       activesupport (~> 4.0)
       charlock_holmes (~> 0.6)
       gitlab-grit (~> 2.6)
       gitlab-linguist (~> 3.0)
-      rugged (~> 0.19.0)
+      rugged (~> 0.21.0)
     gitlab_meta (7.0)
     gitlab_omniauth-ldap (1.0.4)
       net-ldap (~> 0.3.1)
@@ -334,7 +334,7 @@ GEM
       multi_json (~> 1.0)
       websocket-driver (>= 0.2.0)
     polyglot (0.3.4)
-    posix-spawn (0.3.8)
+    posix-spawn (0.3.9)
     pry (0.9.12.4)
       coderay (~> 1.0)
       method_source (~> 0.8)
@@ -436,7 +436,7 @@ GEM
     ruby-progressbar (1.2.0)
     rubyntlm (0.1.1)
     rubypants (0.2.0)
-    rugged (0.19.0)
+    rugged (0.21.0)
     safe_yaml (0.9.7)
     sanitize (2.1.0)
       nokogiri (>= 1.4.4)
@@ -540,7 +540,7 @@ GEM
       eventmachine (>= 0.12.8)
       http_parser.rb (~> 0.5.1)
       simple_oauth (~> 0.1.4)
-    tzinfo (1.2.1)
+    tzinfo (1.2.2)
       thread_safe (~> 0.1)
     uglifier (2.3.2)
       execjs (>= 0.3.0)