style: optimize timeline rtl style

[xrkffgg]

🤔 This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

none

💡 Background and solution

• https://ant.design/components/timeline-cn/#components-timeline-demo-label
  标签类型在 RTL 模式下样式异常

📝 Changelog

Language	Changelog
🇺🇸 English	optimize timeline lable mode rtl style
🇨🇳 Chinese	优化 Timeline lable 在 RTL 模式下样式

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• 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

[ant-design-bot]

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