Bump cdav-library from `17252ee` to `a82ca88`

Bumps [cdav-library](https://github.com/nextcloud/cdav-library) from `17252ee` to `a82ca88`.
- [Release notes](https://github.com/nextcloud/cdav-library/releases)
- [Commits](https://github.com/nextcloud/cdav-library/compare/17252ee1adf05af8e8577bb6dd52024f168a269d...a82ca88144a33ea6fa5f0d7fabfde28a39ada3ee

)

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