Merge branch 'deprecated-uniq' into 'master'

Fix deprecation: uniq is deprecated and will be removed from Rails 5.1

See merge request gitlab-org/gitlab-ee!9348

db/fixtures/development/20_vulnerabilities.rb

@@ -124,7 +124,7 @@ class Gitlab::Seeder::Vulnerabilities
 end
 
 Gitlab::Seeder.quiet do
-  Project.joins(:ci_pipelines).uniq.all.sample(5).each do |project|
+  Project.joins(:ci_pipelines).distinct.all.sample(5).each do |project|
     seeder = Gitlab::Seeder::Vulnerabilities.new(project)
     seeder.seed!
   end

ee/changelogs/unreleased/deprecated-uniq.yml

+---
+title: 'Fix deprecation: uniq is deprecated and will be removed from Rails 5.1'
+merge_request: 9348
+author: Jasper Maes
+type: other