fix(comp:alert): cannot change pagination.pageindex through button

[liuzaijiang]

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• The commit message follows our guidelines
• Tests for the changes have been added/updated or not needed
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What is the current behavior?

<template>
  <IxAlert :pagination="pagination">
    <div v-for="(item, index) in titles" :key="index">
      {{ item }}
    </div>
  </IxAlert>
</template>

<script lang="ts" setup>
import { reactive } from 'vue'

const titles = ['上次看到这句话的时候还是上次。', '上次看到这么无语的话，还是在上次。', '上次看到这么的发言还是上次。']

const pagination = reactive({
  pageIndex: 1,
  onChange: (index: number) => {
    pagination.pageIndex = index
  },
})
</script>

当设置了pagination.pageIndex，无法通过分页按钮切换，并且无法触发onChange

What is the new behavior?

修复正常

Other information

[idux-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

Merging #1102 (f477161) into main (9e65136) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1102      +/-   ##
==========================================
+ Coverage   96.95%   96.96%   +0.01%     
==========================================
  Files         321      321              
  Lines       30585    30596      +11     
  Branches     2809     2810       +1     
==========================================
+ Hits        29653    29667      +14     
+ Misses        932      929       -3     

Impacted Files	Coverage Δ
packages/components/alert/src/Alert.tsx	100.00% <100.00%> (+2.85%)	⬆️

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