[Security] Bump @nextcloud/dialogs from 3.1.1 to 3.1.2

Bumps [@nextcloud/dialogs](https://github.com/nextcloud/nextcloud-dialogs) from 3.1.1 to 3.1.2. **This update includes a security fix.**
- [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/v3.1.1...v3.1.2

)

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