Bump nextcloud-vue-collections from 0.5.4 to 0.5.6

Bumps [nextcloud-vue-collections](https://github.com/juliushaertl/nextcloud-vue-collections) from 0.5.4 to 0.5.6.
- [Release notes](https://github.com/juliushaertl/nextcloud-vue-collections/releases)
- [Commits](https://github.com/juliushaertl/nextcloud-vue-collections/compare/v0.5.4...v0.5.6

)

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