Build(deps): Bump @nextcloud/dialogs from 4.1.0 to 4.2.1

Bumps [@nextcloud/dialogs](https://github.com/nextcloud-libraries/nextcloud-dialogs) from 4.1.0 to 4.2.1.
- [Release notes](https://github.com/nextcloud-libraries/nextcloud-dialogs/releases)
- [Changelog](https://github.com/nextcloud-libraries/nextcloud-dialogs/blob/v4.2.1/CHANGELOG.md)
- [Commits](nextcloud-libraries/nextcloud-dialogs@v4.1.0...v4.2.1)

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

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

Author: dependabot[bot]