Fix: packages_and_registries_spec.rb unstable blur trigger issue

- Trigger blur event via blur instead of click on body

spec/features/groups/settings/packages_and_registries_spec.rb

@@ -90,9 +90,10 @@ RSpec.describe 'Group Packages & Registries settings' do
         expect(page).to have_content('Do not allow duplicates')
 
         fill_in 'Exceptions', with: ')'
-      end
+
         # simulate blur event
-      find('body').click
+        find('#maven-duplicated-settings-regex-input').native.send_keys(:tab)
+      end
 
       expect(page).to have_content('is an invalid regexp')
     end