Merge branch '356410-fix-labels-selection-darkmode' into 'master'

Fix alignment of checked items in assignee/reviewers dropdown

See merge request gitlab-org/gitlab!83431

app/assets/stylesheets/framework/dropdowns.scss

@@ -503,6 +503,7 @@
 
         &.dropdown-menu-user-link::before {
           top: 50%;
+          transform: translateY(-50%);
         }
       }