refactor: correct the type definition for popupContainer

[oljc]

Types of changes

• New feature
• Bug fix
• Enhancement
• Component style change
• Typescript definition change
• Documentation change
• Coding style change
• Refactoring
• Test cases
• Continuous integration
• Breaking change
• Others

Background and context

使用了 trigger 的组件很多，但它们的 popupContainer 的类型定义不统一。

Solution

与 trigger 的 popupContainer 定义一致

popupContainer: {
      type: [String, Object] as PropType<string | HTMLElement>,
 },

How is the change tested?

Changelog

Component	Changelog(CN)	Changelog(EN)	Related issues
	修正 popupContainer 的类型定义	correct the type definition for popupContainer

Checklist:

• Test suite passes (npm run test)
• Provide changelog for relevant changes (e.g. bug fixes and new features) if applicable.
• Changes are submitted to the appropriate branch (e.g. features should be submitted to feature branch and others
  should be submitted to main branch)

Other information

方便 CR 没有 docgen

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