fix: dialog alert ts error

[PengYYYYY]

🤔 这个 PR 的性质是？

• 日常 bug 修复
• 新特性提交
• 文档改进
• 演示代码改进
• 组件样式/交互改进
• CI/CD 改进
• 重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他

🔗 相关 Issue

💡 需求背景和解决方案

📝 更新日志

• fix(dialog): 修复 alert 类型错误

☑️ 请求合并前的自查清单

⚠️ 请自检并全部勾选全部选项。⚠️

• 文档已补充或无须补充
• 代码演示已提供或无须提供
• TypeScript 定义已补充或无须补充
• Changelog 已提供或无须提供

[github-actions]

Size Change: 0 B

Total Size: 633 kB

ℹ️ View Unchanged

Filename	Size
./dist/tdesign.css	42.8 kB
./dist/tdesign.js	351 kB
./dist/tdesign.min.css	38.1 kB
./dist/tdesign.min.js	202 kB

[codecov-commenter]

Codecov Report

Merging #796 (f9c8218) into develop (a0db0df) will increase coverage by 4.04%.
The diff coverage is 66.79%.

@@             Coverage Diff             @@
##           develop     #796      +/-   ##
===========================================
+ Coverage    57.56%   61.60%   +4.04%     
===========================================
  Files          346      354       +8     
  Lines        12828    13260     +432     
  Branches      2405     2500      +95     
===========================================
+ Hits          7384     8169     +785     
+ Misses        5200     4837     -363     
- Partials       244      254      +10     

Impacted Files	Coverage Δ
src/avatar/group.tsx	97.14% <ø> (ø)
src/breadcrumb/breadcrumb-item-props.ts	100.00% <ø> (ø)
src/cascader/props.ts	91.66% <ø> (ø)
src/cascader/utils/inputContent.ts	59.45% <0.00%> (+6.68%)	⬆️
src/date-picker/date-picker.tsx	46.57% <0.00%> (+0.72%)	⬆️
src/dialog/props.ts	70.00% <0.00%> (-30.00%)	⬇️
src/hooks/useVirtualScroll.ts	24.51% <ø> (ø)
src/input/index.ts	100.00% <ø> (ø)
src/menu/menu.tsx	61.90% <ø> (ø)
src/select/option.tsx	16.66% <ø> (ø)
... and 123 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 90bedd2...f9c8218. Read the comment docs.

[github-actions]