fix: 修复 suffixIcon slot 写法失效问题

[honkinglin]

🤔 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(DatePicker): 修复 suffixIcon slot 写法失效问题

• 本条 PR 不需要纳入 Changelog

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⚠️ 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]

[codecov-commenter]

Codecov Report

Merging #1280 (3bd7528) into develop (492d477) will increase coverage by 0.03%.
The diff coverage is 40.61%.

@@             Coverage Diff             @@
##           develop    #1280      +/-   ##
===========================================
+ Coverage    57.94%   57.98%   +0.03%     
===========================================
  Files          407      408       +1     
  Lines        15371    15302      -69     
  Branches      2931     2907      -24     
===========================================
- Hits          8907     8873      -34     
+ Misses        6187     6153      -34     
+ Partials       277      276       -1     

Impacted Files	Coverage Δ
src/cascader/cascader.tsx	64.00% <ø> (ø)
src/color-picker/color-picker.tsx	81.25% <ø> (ø)
src/date-picker/base/Header.tsx	7.57% <0.00%> (-0.37%)	⬇️
src/date-picker/date-picker-panel-props.ts	100.00% <ø> (+90.00%)	⬆️
src/date-picker/date-range-picker-panel-props.ts	100.00% <ø> (+90.90%)	⬆️
src/date-picker/date-range-picker-props.ts	42.85% <0.00%> (-11.69%)	⬇️
src/date-picker/hooks/useRange.ts	35.89% <ø> (ø)
src/date-picker/hooks/useSingle.ts	37.28% <ø> (ø)
src/date-picker/hooks/useTableData.ts	17.64% <ø> (ø)
src/date-picker/panel/RangePanel.tsx	36.36% <ø> (ø)
... and 148 more

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