the MenuItem's danger attribute is invalid in Dropdown Comp

[ghost]

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

Version

2.2.6

Environment

OS: windows 10; node: 16.3; Vue:3.0.5; Chrome: 92.0.4515.131

Reproduction link

Steps to reproduce

when Menu component in Dropdown component, the danger attribute is invalid

What is expected?

the label show danger color when has danger attribute's Menu in Dropdown

What is actually happening?

invalid

[github-actions]

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