悬浮按钮target属性类型错误

[Alkaidcc]

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• [x] I have searched the issues of this repository and believe that this is not a duplicate.

Version

4.2.1

Environment

Reproduction link

https://antdv.com/components/float-button-cn#api

https://github.com/vueComponent/ant-design-vue/blob/1c82940160a804cbaaf393064314674b555153b8/components/float-button/interface.ts#L23

Steps to reproduce

What is expected?

float-button target属性支持String类型

What is actually happening?

float-button target属性不支持String类型