Chore(deps): Bump @nextcloud/vue from 7.6.0 to 8.15.1

Bumps [@nextcloud/vue](https://github.com/nextcloud-libraries/nextcloud-vue) from 7.6.0 to 8.15.1.
- [Release notes](https://github.com/nextcloud-libraries/nextcloud-vue/releases)
- [Changelog](https://github.com/nextcloud-libraries/nextcloud-vue/blob/master/CHANGELOG.md)
- [Commits](nextcloud-libraries/nextcloud-vue@v7.6.0...v8.15.1)

---
updated-dependencies:
- dependency-name: "@nextcloud/vue"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>