Updated the gitlab_git gem

**What does this do?**
It updated the version of gitlab_git to the latest version

**Why is this needed?*
There was a bug in rugged (dependency of gitlab_git) that causes a segfault
error when seeding the database. That error has been fixed and the fix is in the
latest version of gitlab_git
Signed-off-by: Jeroen van Baarsen <jeroenvanbaarsen@gmail.com>

Gemfile

@@ -44,7 +44,7 @@ gem "browser"
 
 # Extracting information from a git repository
 # Provide access to Gitlab::Git library
-gem "gitlab_git", '~> 7.1.12'
+gem "gitlab_git", '~> 7.1.13'
 
 # Ruby/Rack Git Smart-HTTP Server Handler
 gem 'gitlab-grack', '~> 2.0.2', require: 'grack'

Gemfile.lock

@@ -225,11 +225,11 @@ GEM
       mime-types (~> 1.19)
     gitlab_emoji (0.1.0)
       gemojione (~> 2.0)
-    gitlab_git (7.1.12)
+    gitlab_git (7.1.13)
       activesupport (~> 4.0)
       charlock_holmes (~> 0.6)
       gitlab-linguist (~> 3.0)
-      rugged (~> 0.21.2)
+      rugged (~> 0.22.2)
     gitlab_meta (7.0)
     gitlab_omniauth-ldap (1.2.1)
       net-ldap (~> 0.9)
@@ -530,7 +530,7 @@ GEM
       sexp_processor (~> 4.1)
     rubyntlm (0.5.0)
     rubypants (0.2.0)
-    rugged (0.21.4)
+    rugged (0.22.2)
     rugments (1.0.0.beta6)
     safe_yaml (0.9.7)
     sanitize (2.1.0)
@@ -723,7 +723,7 @@ DEPENDENCIES
   gitlab-grack (~> 2.0.2)
   gitlab-linguist (~> 3.0.1)
   gitlab_emoji (~> 0.1)
-  gitlab_git (~> 7.1.12)
+  gitlab_git (~> 7.1.13)
   gitlab_meta (= 7.0)
   gitlab_omniauth-ldap (= 1.2.1)
   gollum-lib (~> 4.0.2)