Bump gitlab_git to 9.0.3

CHANGELOG

 Please view this file on the master branch, on stable branches it's out of date.
 
 v 8.6.0 (unreleased)
+  - Bump gitlab_git to 9.0.3 (Stan Hu)
   - Support Golang subpackage fetching (Stan Hu)
   - Bump Capybara gem to 2.6.2 (Stan Hu)
   - Contributions to forked projects are included in calendar

Gemfile.lock

@@ -359,7 +359,7 @@ GEM
       posix-spawn (~> 0.3)
     gitlab_emoji (0.3.1)
       gemojione (~> 2.2, >= 2.2.1)
-    gitlab_git (9.0.1)
+    gitlab_git (9.0.3)
       activesupport (~> 4.0)
       charlock_holmes (~> 0.7.3)
       github-linguist (~> 4.7.0)