select组件添加dropdownClassName无效

[yiptsangkin]

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

Version

2.0.0-beta.5

Environment

mac chrome vue2.6.11 vue-cli3

Reproduction link

https://antdv.com/components/select-cn/

Steps to reproduce

设置添加dropdownClassName没有生效

What is expected?

能够生效

What is actually happening?

没有生效

[github-actions]

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