build(deps): bump @vue/devtools-api from 6.0.0-beta.11 to 6.0.0-beta.12 (#971)

build(deps): bump @vue/devtools-api from 6.0.0-beta.11 to 6.0.0-beta.12 (#971)

Bumps [@vue/devtools-api](https://github.com/vuejs/vue-devtools/tree/HEAD/packages/api) from 6.0.0-beta.11 to 6.0.0-beta.12.
- [Release notes](https://github.com/vuejs/vue-devtools/releases)
- [Changelog](https://github.com/vuejs/vue-devtools/blob/next/release.js)
- [Commits](https://github.com/vuejs/vue-devtools/commits/v6.0.0-beta.12/packages/api)

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