Fix 'Board with milestone' feature spec

Signed-off-by: Rémy Coutable <remy@rymai.me>

spec/features/boards/board_with_milestone_spec.rb

@@ -212,7 +212,7 @@ describe 'Board with milestone', :js do
 
       click_button 'Milestone'
 
-      click_link milestone.title
+      find('a', text: milestone.title).trigger('click')
 
       click_button 'Create'
     end