chore(deps): Bump @nextcloud/calendar-js from 5.0.4 to 6.0.0

Bumps [@nextcloud/calendar-js](https://github.com/nextcloud/calendar-js) from 5.0.4 to 6.0.0.
- [Release notes](https://github.com/nextcloud/calendar-js/releases)
- [Changelog](https://github.com/nextcloud/calendar-js/blob/main/CHANGELOG.md)
- [Commits](https://github.com/nextcloud/calendar-js/compare/v5.0.4...v6.0.0

)

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

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