fix(TimeLine): Correct className

[linhf123]

[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
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🔗 Related issue link

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💡 Background and solution

TimeLine 的 className 会被应用到子元素上
修改前：

修改后：

📝 Changelog

Language	Changelog
🇺🇸 English	Correct className
🇨🇳 Chinese	纠正 className

☑️ 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]

[codecov]

Codecov Report

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

Coverage data is based on head (6d51bed) compared to base (766e7f8).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #40700   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          606       606           
  Lines        10287     10289    +2     
  Branches      2789      2790    +1     
=========================================
+ Hits         10287     10289    +2     

Impacted Files	Coverage Δ
components/timeline/TimelineItemList.tsx	100.00% <ø> (ø)
components/tour/style/index.ts	100.00% <ø> (ø)
components/tour/panelRender.tsx	100.00% <100.00%> (ø)
components/tour/index.tsx	100.00% <0.00%> (ø)
components/tour/PurePanel.tsx	100.00% <0.00%> (ø)
components/date-picker/style/index.ts	100.00% <0.00%> (ø)

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[afc163]

来个测试用例

[linhf123]

来个测试用例

已添加