fix: 修复 datepicker 下拉样式问题

[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(组件名称): 处理问题或特性描述 ...

• [ ] 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[bot]]

[codecov-commenter]

Codecov Report

Merging #1268 (6ea380b) into develop (153e56e) will decrease coverage by 0.13%. The diff coverage is 70.71%.

@@             Coverage Diff             @@
##           develop    #1268      +/-   ##
===========================================
- Coverage    59.87%   59.74%   -0.14%     
===========================================
  Files          992     1007      +15     
  Lines        17502    17669     +167     
  Branches      4005     4034      +29     
===========================================
+ Hits         10479    10556      +77     
- Misses        7023     7113      +90     

Impacted Files	Coverage Δ
src/calendar/Calendar.tsx	81.60% <ø> (ø)
src/date-picker/DatePicker.tsx	14.66% <ø> (ø)
src/date-picker/DateRangePicker.tsx	10.00% <ø> (ø)
src/date-picker/base/Header.tsx	43.83% <0.00%> (-1.88%)	:arrow_down:
src/date-picker/defaultProps.ts	100.00% <ø> (ø)
src/input-number/_example/align.jsx	100.00% <ø> (ø)
src/input-number/_example/size.jsx	100.00% <ø> (ø)
src/input-number/defaultProps.ts	100.00% <ø> (ø)
src/message/MessageClose.tsx	77.77% <ø> (ø)
src/message/_example/close-all.jsx	25.00% <ø> (ø)
... and 82 more

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