fix: use flex-end in justify- instead of end to fix Next.js warnings (DevExpress#29806)

Author: VasilyStrelyaev

packages/devextreme-scss/scss/widgets/base/chat/layout/chat-messagegroup/_index.scss

@@ -40,5 +40,5 @@
 }
 
 .dx-chat-messagegroup-alignment-end {
-  justify-items: end;
+  justify-items: flex-end;
 }

packages/devextreme-scss/scss/widgets/fluent/scheduler/_index.scss

@@ -118,7 +118,7 @@ $fluent-scheduler-agenda-time-panel-cell-padding: 8px;
 .dx-scheduler-all-day-title {
   display: flex;
   align-items: center;
-  justify-content: end;
+  justify-content: flex-end;
   height: $fluent-scheduler-all-day-table-cell-height;
   font-size: $fluent-scheduler-all-day-title-font-size;
   border-bottom: baseScheduler.$scheduler-base-border;