updated gitlab_git to fix issue #5858 and updated changelog

CHANGELOG

@@ -2,6 +2,7 @@ Please view this file on the master branch, on stable branches it's out of date.
 v 8.5.0 (unreleased)
   - Add "visibility" flag to GET /projects api endpoint
+  - Upgrade gitlab_git to 7.2.23 to fix commit message mentions in first branch push
 v 8.4.0 (unreleased)
   - Allow LDAP users to change their email if it was not set by the LDAP server

Gemfile

@@ -49,7 +49,7 @@ gem "browser", '~> 1.0.0'
 # Extracting information from a git repository
 # Provide access to Gitlab::Git library
-gem "gitlab_git", '~> 7.2.22'
+gem "gitlab_git", '~> 7.2.23'
 # LDAP Auth
 # GitLab fork with several improvements to original library. For full list of changes

Gemfile.lock

@@ -356,7 +356,7 @@ GEM
       posix-spawn (~> 0.3)
     gitlab_emoji (0.2.0)
       gemojione (~> 2.1)
-    gitlab_git (7.2.22)
+    gitlab_git (7.2.23)
       activesupport (~> 4.0)
       charlock_holmes (~> 0.7.3)
       github-linguist (~> 4.7.0)
@@ -932,7 +932,7 @@ DEPENDENCIES
   github-markup (~> 1.3.1)
   gitlab-flowdock-git-hook (~> 1.0.1)
   gitlab_emoji (~> 0.2.0)
-  gitlab_git (~> 7.2.22)
+  gitlab_git (~> 7.2.23)
   gitlab_meta (= 7.0)
   gitlab_omniauth-ldap (~> 1.2.1)
   gollum-lib (~> 4.1.0)