chore(deps): update dependency vue to v2.6.12

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
vue	devDependencies	patch	2.6.11 -> 2.6.12

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Release Notes

vuejs/vue

### [`v2.6.12`](https://togithub.com/vuejs/vue/compare/v2.6.11...v2.6.12) [Compare Source](https://togithub.com/vuejs/vue/compare/v2.6.11...v2.6.12)

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