Menu 组件的 selectedKeys 类型错误，不支持 array 类型

[xunmi1]

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

Version

1.3.6

Environment

vue 2.6.9; ant-design-vue: 1.3.6

Reproduction link

Steps to reproduce

在 1.3.6 版本 selectedKeys 设为数组时，控制台警告 selectedKeys 只能是 String 或 Number。在 1.3.5 版本则正常

What is expected?

selectedKeys 应该包含 array 类型，向下兼容

What is actually happening?

在 1.3.6 版本 selectedKeys 不支持数组类型，疑似是 dbc0b2e 提交造成，
https://github.com/vueComponent/ant-design-vue/blob/master/components/menu/index.jsx 的24行
selectedKeys: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),

[github-actions]

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