Bump christophwurst/nextcloud from 18.0.4 to 19.0.0

Bumps [christophwurst/nextcloud](https://github.com/ChristophWurst/nextcloud_composer) from 18.0.4 to 19.0.0.
- [Release notes](https://github.com/ChristophWurst/nextcloud_composer/releases)
- [Commits](https://github.com/ChristophWurst/nextcloud_composer/compare/v18.0.4...v19.0.0

)

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