Bump @nextcloud/vue from 2.3.0 to 2.6.0

Bumps [@nextcloud/vue](https://github.com/nextcloud/nextcloud-vue) from 2.3.0 to 2.6.0.
- [Release notes](https://github.com/nextcloud/nextcloud-vue/releases)
- [Commits](https://github.com/nextcloud/nextcloud-vue/compare/v2.3.0...v2.6.0

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>