Merge branch 'sh-bump-ruby-version' into 'master'

.gitlab-ci.yml

.rubocop.yml

.ruby-version

Gemfile

Gemfile.lock

lib/action/custom.rb

lib/gitlab_access.rb

lib/gitlab_keys.rb

lib/gitlab_lfs_authentication.rb

lib/gitlab_logger.rb

lib/gitlab_net.rb

lib/gitlab_post_receive.rb

lib/gitlab_shell.rb

lib/http_helper.rb

lib/httpunix.rb

spec/gitlab_keys_spec.rb

spec/gitlab_logger_spec.rb

spec/gitlab_net_spec.rb

spec/gitlab_shell_gitlab_shell_spec.rb

spec/vcr_cassettes/custom-action-ok-not-json.yml