Bump @nextcloud/dialogs from 1.1.0 to 1.2.1

Bumps [@nextcloud/dialogs](https://github.com/nextcloud/nextcloud-dialogs) from 1.1.0 to 1.2.1.
- [Release notes](https://github.com/nextcloud/nextcloud-dialogs/releases)
- [Changelog](https://github.com/nextcloud/nextcloud-dialogs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/nextcloud/nextcloud-dialogs/compare/v1.1.0...v1.2.1

)

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