fix build failed

apps/app/src/components/Navbar/GrowiSubNavigation.module.scss

@@ -88,13 +88,13 @@
       padding-right: 8px;
       padding-left: 6px;
       font-size: 14px;
-      font-weight: bs.$fw-bold;
+      font-weight: bs.$font-weight-bold;
     }
     .seen-user-count {
       padding-right: 6px;
       padding-left: 6px;
       font-size: 14px;
-      font-weight: bs.$fw-bold;
+      font-weight: bs.$font-weight-bold;
       vertical-align: bottom;
     }