Fix 6.3 branch name

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Update ruby to patchlevel 353 (security update)

https://www.ruby-lang.org/en/news/2013/11/22/heap-overflow-in-floating-point-parsing-cve-2013-4164/
Merge branch 'update_ruby_6_3_stable' of /home/git/repositories/gitlab/gitlabhq into 6-3-stable
minor fix to command
Merge branch '6-3-stable' of github.com:gitlabhq/gitlabhq