Select component placeholder property does not support slot

[meesii]

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

Version

3.0.0-alpha.14

Environment

3.0.0-alpha.11

Reproduction link

Steps to reproduce

粉丝年龄2 不限 18-23

What is expected?

placeholder应该会有显示

What is actually happening?

placeholder没有任何显示，devtool里面也看不到任何元素

[meesii]

@tangjinzhou 同样的组件里面，maxTagPlaceholder属性也没有支持slot

[github-actions]

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