Reduce plans new discount badge font weight to 500

GitOrigin-RevId: ee00383135e1a9577842f9f1382ea9e243ebe1b6

services/web/frontend/stylesheets/app/plans/plans-new-design.less

@@ -259,6 +259,7 @@
     color: white;
     display: flex;
     align-items: center;
+    font-weight: 500;
   }
 
   .plans-new-tab-content {