Bump gitlab_git to 10.2.1 to fix false truncated warnings with ISO-8559 files

Closes #18690

CHANGELOG

@@ -11,6 +11,7 @@ v 8.9.1
   - Fix merge requests project settings help link anchor
   - Fix GitLab project import issues related to notes and builds
   - Improve performance of searching repository tags by name by using a memorized tag array
+  - Fix false truncated warnings with ISO-8559 files
   - Fix 404 when accessing pipelines as guest user on public projects
 v 8.9.0

Gemfile.lock

@@ -277,7 +277,7 @@ GEM
       posix-spawn (~> 0.3)
     gitlab_emoji (0.3.1)
       gemojione (~> 2.2, >= 2.2.1)
-    gitlab_git (10.2.0)
+    gitlab_git (10.2.2)
       activesupport (~> 4.0)
       charlock_holmes (~> 0.7.3)
       github-linguist (~> 4.7.0)