fix: cascader 泛型非必传

[crazyair]

[中文版模板 / Chinese template]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• TypeScript definition update
• Bundle size optimization
• Performance optimization
• Enhancement feature
• Internationalization
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Workflow
• Other (about what?)

🔗 Related issue link

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English
🇨🇳 Chinese

☑️ 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]

• 🚨 Please fill changelog in the PR

  • Write with a developer-oriented perspective and narrative method, without describing the details of the repair
  • Describing the problem and the impact on the developer
  • describing the user-first site problem, not your solution
  • Refer: https://ant.design/changelog#4.9.0

• 🚨 请填写 PR 中的 changelog

  • 请用面向开发者的角度和叙述方式撰写，不描述修复细节
  • 描述问题和对开发者的影响
  • 描述用户第一现场的问题，而非你的解决方式
  • 参考：https://ant.design/changelog-cn#4.9.0

[github-actions]

size-limit report 📦

Path	Size
./dist/antd.min.js	281.18 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 (b2dd8d1) compared to base (b4015b6).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##           4.x-stable    #40960   +/-   ##
============================================
  Coverage      100.00%   100.00%           
============================================
  Files             450       450           
  Lines            8333      8333           
  Branches         2539      2539           
============================================
  Hits             8333      8333           

Impacted Files	Coverage Δ
components/cascader/index.tsx	100.00% <100.00%> (ø)

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