Bump @nextcloud/vue from 2.6.5 to 2.9.0

Bumps [@nextcloud/vue](https://github.com/nextcloud/nextcloud-vue) from 2.6.5 to 2.9.0.
- [Release notes](https://github.com/nextcloud/nextcloud-vue/releases)
- [Commits](https://github.com/nextcloud/nextcloud-vue/compare/v2.6.5...v2.9.0

)

Signed-off-by: dependabot[bot] <support@github.com>
Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>