style: Checkbox should use @border-radius-sm

[afc163]

[中文版模板 / Chinese template]

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• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• TypeScript definition update
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🔗 Related issue link

💡 Background and solution

参考 V5 的改动：93908de#diff-17c6a64972b945a29c5a53348d97412a776a8f23badd84a04280998c0f4c0462

Checkbox 应该使用小号圆角，避免修改默认圆角导致 Checkbox 接近圆形，太像 Radio。

📝 Changelog

Language	Changelog
🇺🇸 English	Checkbox should use @border-radius-sm
🇨🇳 Chinese	Checkbox 默认使用 @border-radius-sm 小号圆角。

☑️ Self-Check before Merge

⚠️ Please check all items below before requesting a reviewing. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

[github-actions]

[afc163]

/rebase

[github-actions]

size-limit report 📦

Path	Size
./dist/antd.min.js	281.19 KB
./dist/antd.min.css	66.27 KB
./dist/antd.dark.min.css	67.51 KB
./dist/antd.compact.min.css	66.22 KB
./dist/antd.variable.min.css	66.81 KB

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (02152ed) compared to base (517cd60).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff              @@
##           4.x-stable    #40823   +/-   ##
============================================
  Coverage      100.00%   100.00%           
============================================
  Files             450       450           
  Lines            8333      8333           
  Branches         2539      2539           
============================================
  Hits             8333      8333           

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[BanShan-Alec]

不太理解此改动，为什么只修改default.less，而variable.less还是@checkbox-border-radius: @border-radius-base;

[afc163]

@BanShan-Alec 改漏了，欢迎 PR