Bump cdav-library from `a20daad` to `079b141`

Bumps [cdav-library](https://github.com/nextcloud/cdav-library) from `a20daad` to `079b141`.
- [Release notes](https://github.com/nextcloud/cdav-library/releases)
- [Commits](https://github.com/nextcloud/cdav-library/compare/a20daadaec9eb4ddc2e874bac345cc1b1d28fa04...079b141b563b67e97f91e90cc48bcc5e457ed917

)

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