Update ValidationRule message type

[pastr]

This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Branch merge
• Other (about what?)

What's the background?

The type of message comes from the library async-validator and it has been updated: https://github.com/yiminghe/async-validator/pull/251/files
This PR is to keep ant-design-vue up to date with that change.

Self Check before Merge

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

[tangjinzhou]

but how to use func for message?
if user use func, how to render message?

[pastr]

You can already use it, it was just the type that wasn't up to date
You can see a basic example here: https://codesandbox.io/s/brave-microservice-gjb5y?file=/src/components/form-model-example.vue
The rules for name and region are using a function.
It's also useful when using vue-i18n, the doc of async-validator has a small example here:
https://github.com/yiminghe/async-validator#messages
Hopefully, this answers your questions :)

[tangjinzhou]

👍 I got it, thank you for you pr.

[pastr]

Thanks for your work!

[github-actions]

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