Bump nextcloud-vue from 0.12.7 to 0.12.8

Bumps [nextcloud-vue](https://github.com/nextcloud/nextcloud-vue) from 0.12.7 to 0.12.8.
- [Release notes](https://github.com/nextcloud/nextcloud-vue/releases)
- [Commits](https://github.com/nextcloud/nextcloud-vue/compare/v0.12.7...v0.12.8

)

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