Merge branch 'ajk-fix-protected-branches-seed' into 'master'

Fix protected branches seed

See merge request gitlab-org/gitlab!39323

db/fixtures/development/16_protected_branches.rb

 require './spec/support/sidekiq_middleware'
 
 Gitlab::Seeder.quiet do
-  admin_user = User.find(1)
+  admin_user = User.admins.first
 
   Project.not_mass_generated.each do |project|
     params = {