fix(MessagePlugin): className API invalid (#6097)

* fix: class name

* chore: stash changelog [ci skip]

---------

Co-authored-by: tdesign-bot <tdesign@tencent.com>

Author: Wesley-0808

packages/components/message/message.tsx

@@ -21,6 +21,7 @@ export default defineComponent({
   props: {
     ...props,
     placement: String, // just for animation
+    className: String,
   },
   setup(props, { slots, expose }) {
     const COMPONENT_NAME = usePrefixClass('message');
@@ -49,6 +50,7 @@ export default defineComponent({
         {
           [`${classPrefix.value}-is-closable`]: props.closeBtn || slots.closeBtn,
         },
+        props.className,
       ];
     });
 

packages/tdesign-vue-next/.changelog/pr-6097.md

@@ -0,0 +1,6 @@
+---
+pr_number: 6097
+contributor: Wesley-0808
+---
+
+- fix(MessagePlugin): 修复`className`参数无效的问题 @Wesley-0808 ([#6097](https://github.com/Tencent/tdesign-vue-next/pull/6097))