fix: table border issue

[MadCcc]

[中文版模板 / Chinese template]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
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🔗 Related issue link

close #38724
close #39677
close #39728
close #38735

💡 Background and solution

顺便把 border 改成实色，解决一下重叠之后颜色加深的问题

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Table missing border-bottom in merged cell and unexpected border color if overlapping。
🇨🇳 Chinese	修复 Table 组件合并单元格后底部边框消失和边框重叠时颜色变深的问题。

☑️ 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]

[github-actions]

size-limit report 📦

Path	Size
./dist/antd.min.js	377.6 KB (+39 B 🔺)
./dist/antd-with-locales.min.js	432.89 KB (+38 B 🔺)

[codecov]

Codecov Report

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

Coverage data is based on head (0382a6b) compared to base (6236e35).
Patch has no changes to coverable lines.

❗ Current head 0382a6b differs from pull request most recent head 89fa240. Consider uploading reports for the commit 89fa240 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #39729   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          556       556           
  Lines         9625      9625           
  Branches      2722      2722           
=========================================
  Hits          9625      9625           

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[afc163]

argos 有点奇怪：https://ik.imagekit.io/argos/bfa8e6eae75493577da7372315b867b4486f7acb169efb4d4cae15604595274c

[MadCcc]

之前的 border 时透明色，暗色主题下就是白色带透明度，所以白底上看不出来。实际应该是 table 的 border radius 问题。

[MadCcc]

argos 有点奇怪：https://ik.imagekit.io/argos/bfa8e6eae75493577da7372315b867b4486f7acb169efb4d4cae15604595274c

这个 demo 我改了

[MadCcc]

argos 响应有点慢

[afc163]

顺便把 border 改成实色，解决一下重叠之后颜色加深的问题

changelog 也写一下。

[MadCcc]

顺便把 border 改成实色，解决一下重叠之后颜色加深的问题

changelog 也写一下。

Done.

[afc163]

这个会造成筛选表格时 border 的 transition 效果出现黑条。