Wrong GitLab Shell version in update manual

Created by: f3anaro

In 7.6-to-7.7.md GitLab Shell Version 2.4.0 is used for checkout, but it should be 2.4.1

The gitlab:check gives the following error:

$ sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production
Checking Environment ...

Git configured for git user? ... yes

Checking Environment ... Finished

Checking GitLab Shell ...

GitLab Shell version >= 2.4.1 ? ... FAIL. Please update gitlab-shell to 2.4.1 from 2.4.0
...